How The Rhine River Affected Our Jewish History

 Nadene Goldfoot                                               

Flowing through six countries, the Rhine River has served as a link between southern and northern Europe since Roman times. Originating from mountain brooks in the Swiss Alps, the Rhine travels north into Switzerland's Lake Constance (Europe's third largest), over the surging Rhine Falls (among Europe's largest), and on to Basel, where it becomes a major waterway used to transport goods and raw materials. The Rhine then serves as a border between Germany and France, narrows through deep gorges and meanders through steep-sided valleys renowned for vineyards and castles. At the Netherlands border, the Rhine splits into tributaries that cross an extensive delta and empty into the North Sea. Length: Approximately 1,230 kilometers / 765 miles long.  

A tributary:   Moselle: Travels southwest from Koblenz to France

Main:  Travels southeast from Mainz to Frankfurt

Key Cities along or near the Rhine River: are Amsterdam, Holland and Cologne, Germany  

Koblenz, Mainz and Cologne are larger populated Jewish cities.  Koblenz is where Werner Oster came from who married my father's sister;  my uncle in May 1939, possibly the last Jew out of Germany before the door closed.   

 Over time, the Rhine became a major shipping route and a central axis of the Holy Roman Empire. The Romans' first urban settlement, recognized circa 50 A.D., was on the present-day site of Cologne, Germany.   The city of Koblenz ranks as the third-largest city by population in Rhineland-Palatinate, behind Mainz and Ludwigshafen am Rhein. 

The Rhine was used from Roman times to transport trade and goods deep into inland Europe, with the many castles and fortifications built up around the Middle Rhine attesting to its importance. However, they were built not for any romantic purpose but instead to exact tolls from those using the river—often generating significant wealth for their owners and communities.                                                

The Rhine served as a formidable German border during World War II, a defensive barrier to Allied troops. Fighting brought mass destruction of bridges, trains and ships along the Rhine, including the bridge at Arnhem—immortalized in the film, A Bridge Too Far, and at Nijmegen, over a tributary of the Rhine. Both were part of the Allies' failed "Operation Market Garden." In a separate operation, the Ludendorff Bridge at Remagen was captured by the Allies intact, helping to bring the war to an end. Post-war, the region has focused on political cooperation, economic development and tourism. 

Heidelberg, Germany has had a Jewish presence since the 13th century, but the community was decimated multiple times and ultimately deported during the Holocaust.  Black Death: The Jewish community was decimated in 1349. Expulsion: In 1391, Jews were expelled from Heidelberg and the Palatinate region. Persecution: In the 1930s, the Nazis persecuted Jewish students and community members in Heidelberg. Deportation: In 1940, Jews were deported to Gurs camp in France. Between 1941 and 1945, more Jews were deported to death camps.

In 1933 there were 1,100 Jews in the city (1.3% of the total population). The April 7 expulsion of Jews from the civil services resulted in the dismissal of 34 Jewish professors. By 1935 there was only one "full" Jewish student at the University, the remaining "Jewish" students were of mixed ancestry. Fourteen Polish Jews were expelled in October 1938. The synagogues were demolished on Nov. 10, 1938; its religious objects were confiscated and destroyed by university students. One hundred and fifty Jewish men were deported to Dachau but later released. On Oct. 22, 1940, 339 Jews were transported to Gurs. One hundred Jews were saved from deportation by Protestant Evangelical Pastor Hermann Maas, who got them out of the country. He was subsequently recognized by Yad Vashem as a Righteous Gentile. From 1942 to 1945, a further 103 were deported, mainly to Theresienstadt. Eighteen returned after the war and joined the 50 of mixed marriages that had outlived the war at Heidelberg. 

A new community came into being after World War II, numbering 139 persons in 1967. A new synagogue was consecrated in 1958. In 1979 the Central Council of Jews in Germany (Zentralrat der Juden in Deutschland) opened the Hochschule fuer Juedische Studien (University for Jewish Studies) in Heidelberg. From 2001 it offered a program for rabbinical training in cooperation with Orthodox, Conservative, and Liberal rabbinical seminaries in Jerusalem, New York, and London. In 1987 the Central Council of Jews in Germany established the Central Archives for research on the history of the Jews in Germany, which collects documents from Jewish communities, associations, organizations, and individuals. The Jewish community numbered 188 in 1989 and 550 in 2005. The membership increased due to the immigration of Jews from the former Soviet Union. A new community center was opened in 1994.

 After the war, a Jewish community was re-established in Heidelberg. The city now has a synagogue in the Weststadt district, and "Stolpersteine" (stumbling stones) that mark the locations of former Jewish residents. Impact  The persecution of the Jewish community in Heidelberg was part of a larger Nazi effort to limit Jewish influence and control in Germany. Heidelberg's city council and the city's guilds repeatedly ensured that the ruling Elector limited the number of "his" Jews in Heidelberg so as not to allow Jewish competition to grow. An extremely high municipal taxation of the Jews temporarily residing here also served this purpose.

                                   Koblenz:  3/25/08 From nephew of Werner Oster: David Goldfoot: To get to Koblenz, we went right thru Boppard, which is only about 9 kilometers from where we were staying in Koblenz. Boppard is a beautiful little village right on the Rhine, which is probably the most beautiful part of Germany. I had opportunities to go visit Boppard but I found I couldn't do it. I talked in German to several people who pronounced German just like Uncle Werner did, and I just felt really sad about what happened to him in his life and that I wasn't around when he died, so I just couldn't do it.

        Boppard, city, Rhineland-Palatinate Land (state), western Germany. Boppard is located on the left bank of the Rhine, some 12 miles (20 km) south of the city of Koblenz.  Boppard is still partly surrounded by medieval walls, and its picturesque appearance has made it a centre of tourism. There is also a diversified light industrial sector, with products including machinery and pharmaceuticals. Notable buildings include the Romanesque Church of St. Severus (12th–13th century), the Gothic Carmelite Church (14th century), and the archbishop’s castle (14th century), which now houses the municipal museum. The city also has a spa with mineral springs. Pop. (2003 est.) 16,346.

Werner Oster could not get his red-headed 16 yr old sister out of Germany, and his parents who were killed in concentration camps there.  He had a hard time dealing with that later in life. 

His father had served in the German army and was a decorated soldier in the service of the Kaiser, but was forced to scrub the streets because he was a Jew.  Many wore their uniforms while doing this to show people they had been good citizens.  

8/26/04  I found many Osters in Koblenz, Germany in the burial listings.  That could be his town.  1/27/06  I have found many Jewish Osters that came to the USA from Germany before WWII.  They were shown as "Hebrew" on the immigration lists.  One was Lili E. Oster & H. Oster, b: 1907 arrived 20 Aug 1937 at age 30 from port Cherbourge, France on Berengasia Ship from Germany to NY.                                           

9/18/08  I just found the information on immigration.  Werner came over as a butcher on the ship "George Washington".  Last residence was Boppard and his immigration paper was issued in Stuttgarten.                                      

    St. Louis in the Port of Hamburg:  Hamburg stands on the branching River Elbe at the head of a 110 km (68 mi) estuary to the North Sea, on the mouth of the Alster and Bille. Hamburg is one of Germany's three city-states alongside Berlin and Bremen.   After the Rhine, the Elbe River is Germany’s most significant commercial waterway. It is 724 miles (1,165 kilometers) long, with about 525 miles (845 kilometers) navigable for large ships.

(The info I found says there was no George Washington ship at that time near Germany.  The closest I found was the famous St. Louis.  In May 1939, the German liner,  St. Louis,  sailed from Hamburg, Germany, to Havana, Cuba. The 937 passengers were almost all Jewish refugees. Cuba's government refused to allow the ship to land. The United States and Canada were unwilling to admit the passengers. The St. Louis passengers were finally permitted to land in western European countries rather than return to Nazi Germany. Ultimately, 254 St. Louis passengers were killed in the Holocaust.                                  

                     Hamburg in 1811

 Werner's ship left between May 4 and May 12, 1939 from Boppard to Hamburg.  He got to New York and then went to Texas, he said.  

He was born in Westerburg.  A friend was Arthur Rose.  I've listed him being born in  Westerburg, Hildesheim, Niedersachsen, Germany. 

       Westerburg :  Jews are first mentioned in 1616. In 1760, the Jewish community comprised 75 persons with one rabbi, and by 1754, there was a Jewish school. Public schooling is first known to have been instituted in 1557. Later, the school was also run temporarily as a Latin school.  Werner was born in 1916.  

 Westerburg (German pronunciation: [ˈvɛstɐˌbʊʁk] ) is a small town of roughly 6,000 inhabitants in the Westerwaldkreis in Rhineland-Palatinate, Germany. The town is named after the castle built on a hill above the medieval town centre (Burg is German for “castle”)

9/18/08 Hi, Nadene, thanks for all of this information.  I knew my father was not born in Boppard, and at one time I knew about Westerburg because it's familiar and I had visited the area, but I had forgotten most of the very little bit that I knew.   I never had known the name of the ship he came on. Westerburg: This place is situated in Oldenburg, Weser-Ems, Niedersachsen, Germany, its geographical coordinates are 53° 1' 0" North, 8° 13' 0" East and its original name (with diacritics) is Westerburg.

4/13/11: Came over on George Washington ship from Hamburg, with 18 other Jewish people on board.  Arthur Rose listed as friend.  

A stretch of quaint towns, castle ruins and winegrowing villages alongside the Rhine—between the towns of Koblenz, Bingen and Rüdesheim in the Upper Middle Rhine Valley—is a UNESCO World Heritage Site. Recognized for its beauty as well as the Rhine's importance as a route of cultural exchange, the river has inspired many writers, painters and musicians.

So, The Rhineland is a loosely defined area of Western Germany along the Rhine, chiefly its middle section. It is the main industrial heartland of Germany because of its many factories, and it has historic ties to the Holy Roman Empire, Prussia, and the German Empire.

Resource:

https://www.tauck.com/river-cruises/european-river-facts/rhine-river-facts

https://en.wikipedia.org/wiki/Westerburg 

https://en.wikipedia.org/wiki/Koblenz

https://encyclopedia.ushmm.org/content/en/article/voyage-of-the-st-louis    

https://en.wikipedia.org/wiki/Rhineland     

https://www.britannica.com/place/Boppard   

https://kids.britannica.com/students/article/Elbe-River/274139                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

                                                                                                  

When Jews Moved Into the Rhineland of Germany Like the Famous Kalonymos Line

 Nadene Goldfoot                                                  

                                   Cologne, Germany

The Rhine defines much of the Franco-German border, after which it flows in a mostly northerly direction through the German Rhineland. Finally in Germany, the Rhine turns into a predominantly westerly direction and flows into the Netherlands where it eventually empties into the North Sea.  Here we see Worms, Germany

It's figured that before 321 CE, Jews entered on the Rhineland.  It's thought that during this Roman period, Jews were used as soldiers in the Roman garrisons.  Barbarians were known to be invaders of the land then. .  

 During the 8th and 9th centuries,  the Carolingian royal house (The Carolingian dynasty was a Frankish noble family named after Charles Martel and his grandson Charlemagne, descendants of the Arnulfing and Pippinid clans of the 7th century AD)  had a pro-Jewish policy and encouraged he settlement of Jews in its dominions with the object of developing trade.

"The section of the Rhine between Basel and Mainz is more of a meeting place than a border line. Jewish communities on both banks of the river have always been close, as demonstrated by their unique history and rich heritage.  My uncle, who married my father's sister Anne, was born on 15 October 1916 in Westerburg, was recorded on the day of birth from the residents' registration office of Boppard. He attended elementary school at  home. From 1 April 1932 to 1 April 1935, he completed an apprenticeship at the butcher of butchers Ludwig marigold stone, Kirchgasse 1, run butchers. '  I found many Osters in Koblenz, Germany in the burial listings.  That could be his town.    I have found many Jews that came to the USA from Germany before the 2nd WW.  They were shown as "Hebrew" on the immigration lists.  One was Lili E.who arrived 20 Aug 1937 at age 30 from port Cherbourge, France on Berengasia Ship from Germany to NY.

  To get to Koblenz, we went right thru Boppard, which is only about 9 kilometers from where we were staying in Koblenz. Boppard is a beautiful little village right on the Rhine.  So it appears that not only my uncle by marriage came from the Rhineland, but also my paternal aunt, his wife.  Their children, my 1st cousins, certainly have the Rhineland in their DNA.  

                             Kalonimus Wolf Wissotzky (1824-1904) of Russia

During the Middle Ages, Jews arrived in Mainz, then an important trading city between Europe and Asia. Distinguished members of the Mainz community included the prominent rabbi Gershom Meor Hagolah and the Kalonymos family, originally from Lucca in Italy, whose great scholarship includes some of Europe’s oldest rabbinical texts. Kalonymmos ben Kalonymos (Maesatro Calo) 1286-and after who lived in French centers and in Rome; (a translator from Arabic into Hebrew and Latin)  1328) Among the population that inhabited Lucca in the medieval era, there was also a significant presence of Jews. The first mention of their presence in the city is from a document from the year 859. The Jewish community was led by the Kalonymos family (which later became a major component of proto-Ashkenazic Jewry).Through genealogy, I have discovered our family connection to this Kalonymos family.  

 Through the development of Jews living in Germany of the Middle Ages, their language of Hebrew turned into Yiddish, a form of Hebrew mixed with German, Old French and Old Italian  and Slavic languages.  These Jews are referred to as the line of Ashkenazi Jewry.  

                Medieval city center of Worms, a rather shocking name to our Western ears.  Worms' name is of Celtic origin: Borbetomagus meant "settlement in a watery area". This was eventually transformed into the Latin name Vormatia, in use since the 6th century, which was preserved in the Medieval Hebrew form Vermayza (ורמייזא) and the contemporary Polish form Wormacja.

Worms:  This was a famous center of Jewish scholarship in the Medieval Period, Rashi (1040-1105), a famous Rabbi, studied here from 1055 to 1065.  It was closely associated with the communities of Speyer and Mainz.   Worms, Speyer and Mainz were called the SHUM. By 1933, the beginning of Nazi hatred toward Jews, there were 1,200 Jews in Worms. They were all exterminated.  The Jewish community of Worms, founded soon after that of Mainz, has preserved an extraordinary medieval cemetery and a reconstructed synagogue where the famous Talmudist Rashi of Troyes studied.Jews arrived here around the 10th century as it was a well established community by the 1000s.  Emperor Henry IV was given  financial assistance by the Jews, so in return he rewarded them with substantial privileges in 1074 and again in 1090, granting them what they hadn't achieved as yet:  freedom of commerce, security of property, and imperial protection. 

The community was then annihilated during the 1st Crusade.  The Jews re-established it shortly afterward and again it was destroyed in the Black Death outbreaks of 1349, but that took place at least 249 years later.  Worms held an expulsion in 1616 of the Jews, and we see that only 26 years later Jews were living there but with restrictions.  Seventy-three years later, King Louis XIV's soldiers, in1689,  held a massacre of Jews.  Jews could not trust their lives by living in Worms.  

Speyer: Founded by the Romans, it is one of Germany's oldest cities. Speyer Cathedral, a number of other churches, and the Altpörtel ("old gate") dominate the Speyer landscape. In the cathedral, beneath the high altar, are the tombs of eight Holy Roman Emperors and German kings.  The city is famous for the 1529 Protestation at Speyer. One of the ShUM-cities which formed the cultural center of Jewish life in Europe during the Middle Ages, Speyer and its Jewish courtyard was inscribed on the UNESCO World Heritage List in 2021.

Mainz; Actually, Jews lived here during Roman period but only dates from the 10th century when it was a principal community of Northern Europe and the main center for the diffusion of rabbinic learning.  Jews were expelled in 1012 but returned as fast as they could.  Jews obtained protection from the  arch-bishop on the advent of the crusaders in 1096, but hundreds were murdered anyway.  In 1209, the emperor conceded to the archbishop his rights over the Jews.  A series of massacres happened at the time of the Black Death in 1349.  Expulsion edicts were issued in 1438, then again in 1462 and 1470.  

Starting in the 11th century, Jews gradually settled in cities near the Rhine. Community presence is documented in Speyer around 1080 (ritual bath, medieval synagogue, museum) and around 1150 in Strasbourg (ritual bath, museums) and Frankfurt (cemetery, synagogue, museum), as well as in Basel, Freiburg, and many other cities. Despite periods of bloody persecution, in particular linked to the Crusades (1095, 1146) and the Armleder revolt (1338), the Rhineland Jews left numerous testimonies of their endurance and their creativity: material traces (synagogues, cemeteries, ritual baths) and immaterial traces (books, rabbinical treatises, the Western Yiddish language, etc)."

Resource:

https://www.seat61.com/places-of-interest/rails-down-the-rhine.htm

https://www.emeraldcruises.com/blogs/top-6-cities-on-the-rhine-river

https://en.wikipedia.org/wiki/Rhine

https://en.wikipedia.org/wiki/Worms,_Germany

https://jewisheritage.org/the-european-route-of-judaism-on-the-rhineland

How Endogamous Are We Jews Who Are An Endogamous People ?

 Nadene Goldfoot                                                             

                             Ashkenazic Jewish grandmother, Zlata Jermulowske from Lazdijai, Suwalki, Lithuania born January 11, 1886, a part of my life and her parents were Joshua Charles "Hatzkel" Isaiahel Jermulowskie and possibly Esther Decatsky, but not 100% sure. We know his first wife died and he remarried a Dora Leah and had more children from which Zlata was the last to be born to Esther before her death.   In fact, Esther may have died giving birth to Zlata.   Before her time, men were able to marry multiple women at a time, given the example of Jacob who had 4 wives. Was she related to her husband, Nathan Goldfoot?  If my father had a DNA test done (born in 1908) we would be able to tell.  My father's sister was related, however, to her husband by testing of one of her daughters.  The connection was closer than I had thought.  The test is available at GedMatch.(Genesis) com.  Give it a name from the program you have provided and it can tell if its parents were related.    

Muslims, with Islam established after Mohammad's death in 620, have allowed men to have 4 wives at a time.   

Endogamy was very common among Ashkenazi Jews; they very rarely married non-Jews, and if they did it usually meant that the offspring were not raised Jewish. That's why it is more common to find traces of Jewish DNA among non-Jewish Slavs than it is to find Slavic DNA within Ashkenazi Jewish populations.

Being they stayed together as a group, and often lived in very close proximity, such as in ghettos, they were marrying their spouses who were actually related to them with unions happening in their families in previous generations so they were not aware of their family trees. 

Abraham had married Sarah who was his niece, and they knew of this.  One thing the Jews never did, and the Egyptian royalty did, was to marry their sisters.  Cousins were acceptable, however.  

Polygamy was practiced with Solomon setting the example, having a 1,000 wives and concubines.  His reasoning was more for making peace with other people by marrying into their royal families, which seemed to work, however.  

Jacob had 4 wives while his father, Isaac had only one, Rebecca.  Proverbs 31 seems to picture a monogamous household.  The society reflected in the Talmud is essentially monogamous, with only a handful of rabbis being recorded as having more than one wife.  This ideal of Jewish life with one wife continued.  

The takkanah of Rabbi Gershom Ben Judah (965-1028)forbade polygamy in about 1000 CE.  This was like a law now that gave formal sanction among Ashkenazi Jews to what was already generally accepted.  

How was such a law policed?  We have no policing in Judaism.  I would think that peer pressure would control such a law to being prescribed.  My thinking is that by 1500, people were doing pretty well in not taking multiple wives with the exceptions of divorce and death like today.  No more harems like Kings David and Solomon.  So we can say that for the past 1,000 years, there has been no polygamy within the Jewish Community.  

The Rabbi, known as Rabbenu (Our teacher) Gershom Meor ha-Golah (Light of the Diaspora) was born in Metz of Lorraine thatwas a former region in northeast France bordering Belgium, Luxembourg and Germany. and later lived in Mainz, Germany  where he directed an academy. 

    At the time in Rhineland/Germany, the Crusades were starting in 1096-1999 with attacks against Jews in Northern France and especially in the Rhineland where massacres occurred in Mainz, Worms, Speyer, Cologne, etc...and in Jerusalem in 1099 as well.  The 2nd Crusade of 1147-1149 attacked Jews in the same places because of a Monk, Rudolf in France and Rhineland.  We Jews were never good enough to suit the Christians.  No wonder these Rabbis went overboard trying to wipe out sin in Jews.  

 He was considered the earliest notable Western European Jewish scholar, a famous Rabbinic authority.  He was one of the 1st commentators on the Talmud. Since there are 2 distinct Talmuds, one from Palestine and the other called the Babylonian Talmud, he may have worked on the Palestinian one,  and corrected many copyists' errors.  Gershon  also transcribed  the biblical Masorah to ensure accurate  reading.   According to tradition, he wrote an entire commentary on the Talmud, but only fragments  have survived.  Rabbi Gershom's legal decisions and regulations (takkanot) were accepted as binding by European Jewry;  they included bans on polygamy, divorcing a  woman without her consent, reading letters directed to others, cutting pages out of books, and mocking converts who had returned to Judaism (which would have been mainly the the Marranos, Spanish who were forced to accept Catholicism to evade death.                                   

                    Crusaders during their hayday...

As if G-d is listening to all this horror coming from his mind along with the good decisions, what happened to his family seems just.  His son (and possibly his wife) was forcibly baptized in 1012, and Gershom wrote a number of penitential prayers  expressing his grief.  

Joshua Cohen also agrees with me with his article about the twisted logic of Medieval German piousness.  "Sefer Hasidim, or Book of the Pious", was its greatness, authored by Rabbi Judah ben Samuel of Regensburg (1140-1217) and/or his father Samuel (the latter working under the influence of his father, Kalonymus ben Isaac the Elder). Most scholars agree that Rabbi Judah’s student, Rabbi Eleazar Rokeach, compiled the extant text. Kalonymus is a family line my Goldfoot family is connected with.  Seems as if some rabbis were overworking their minds on what compiled a sin in Germany during this period. 

It was in 1096 that the German Crusaders massacred Jews in European towns.  Shortly after in 1099, the Jewish community in Jerusalem was massacred by the Crusaders.  

Among the Spanish and Oriental Jews (Sephardic and Mizrachi Jews) on the other hand, polygamy continued to be legal, though by no means general. 

 In Italy, down to the 17th century, a person whose wife was barren was occasionally permitted by papal license (Catholicism) to take a 2nd wife.  With Europeanization of many oriental communities in recent generation, polygamy has become increasingly rare.  

Traditionally, the groom  is to smash a wine glass...this looks like a can used in this Israeli wedding. Shattered glass symbolizes the fragility of our relationship and reminds us that we must treat our relationship with special care. This custom was also incorporated into the ceremony to remind everyone that even at the height of personal joy, we must, nevertheless, remember the destruction of the Temple in Jerusalem in the year 70. Note the Israeli large prayer shawl used by all the men of Israel.  

In Israel, monogamy is now enforced by law, though existing polygamous marriages are recognized.  Being 20% of the population are not Jews, but Muslims who allow 4 wives to this day, I'm not sure how Israel is handling this situation.  Their population as increased quickly, I note. Since at least 1959, polygamous marriages have been prohibited in Israel, which applies to members of each confessional community, including the Jewish and Muslim.  And that's how the law is written.  DNA testing will tell the tale.  

In the Palestinian Territories, unless its been changed recently, "Polygyny, whereby a husband has more than one wife, is explicitly permitted under Islam. There are also the classical injunctions that a man must treat all co-wives equitably and provide them with separate dwellings, and a man must declare his social status in the marriage contract.  This is why their numbers have increased.

Polyandry, whereby a wife has more than one husband, is not permitted. Residents of East Jerusalem are subject to Israeli marriage law, which since at least 1959 has barred the formation of polygamous unions in Israel.

In the USA Polygamy as a crime originated in the common law, and it is now outlawed in every state. In the United States, polygamy was declared unlawful through the passing of Edmunds Anti-Polygamy Act of 1882.Members of The Church of Jesus Christ of Latter-day Saints practiced polygamy between 1840 and 1890. At present, the Church strongly asserts that God's standard for marriage is only between one man and one woman.  Devoted Church members opted not to practice polygamy. During the year 1857, about half of the people living in the Utah Territory are in a polygamous family. By 1870, this number of people living in polygamous households dropped to about 25 to 30 percent. It has continually declined through the passage of time.  Mostly, groups living in Mexico practiced it.  However, the LDS (Mormons) have continued, and even have TV sit-coms about all living together.                                          

Well, Polygamy helped to create endogamy that we find in our DNA today. it's not surprising to find that some of our relatives are related to each other.  My father's sister's DNA shows a genetic connection to her husband from Germany, and she and my father's line were from Lithuania.  The connection, quite obvious in the DNA, is not prevented by countries of the people.  It could go back as far as to ancient Israel, or obviously-to Germany where Ashkenazic Jewry started.  I think that's our situation.  

I've traced my father's line of Goldfus as far back as to the 1700s in Telsiai, Lithuania finding Iones 'Jonah' Goldfus c:1730.  There was a Swedish invasion in 1710 into Telz, as it's called today, which had to have been the Vikings!  2/3 of its population perished from epidemics with that happening.   A few Jews were known to be living in this city in the 1400s.  The Crusaders mentioned Jews being there  in 1320.  Chances are that my father's people were there from Germany by the 1500s at least.  

Diseases inherited in an autosomal recessive pattern often occur in endogamous populations. Among Ashkenazi Jews, a higher incidence of specific genetic disorders and hereditary diseases has been verified, including: Alport syndrome. Colorectal cancer due to hereditary nonpolyposis colorectal cancer is another.

Tay–Sachs disease is the most commonly known, which can present as a fatal illness of children that causes mental deterioration prior to death, was historically extremely common among Ashkenazi Jews, with lower levels of the disease in some Pennsylvania Dutch, Italian, Irish Catholic, and French Canadian descent, especially those living in the Cajun community of Louisiana and the southeastern Quebec. Since the 1970s, however, proactive genetic testing has been quite effective in eliminating Tay–Sachs from the Ashkenazi Jewish population.  

Parkinson's has hit my family in a cousin by marriage who turns out to be my 4th cousin.   The disease (G2019S/LRRK2 mutation; The LRRK2 mutation on the main haplotype, shared by 1. Ashkenazi Jews, 2.North Africans, and 3.Europeans, initially arose in the Near East at least 4000 years ago. Because of a founder effect, the ancestors of present-day Ashkenazi Jews may have kept the low-frequency G2019S mutation through the different diasporas, whereas Near Eastern daughter populations lost the mutation. The mutation might then have been "reintroduced by recurrent gene flow from Ashkenazi populations to other Jewish, European, and North African populations. The present-day frequency of the mutation in control populations (0.05% in Europeans, 0.5% in North-African Arabs and 1% in Ashkenazi Jews) may support this scenario".)

What's happening to the Diaspora?  Two out of every five Diaspora Jews is married to a non-Jew, though rates of assimilation vary widely with two European countries representing the extremes: Poland has the highest rate of intermarriage and Belgium the lowest. These are some of the findings of a special report on intermarriage published.  About two-thirds of U.S. Jewish adults are either married (59%) or living with a partner (7%). Among those who are married, many have spouses who are not Jewish. Fully 42% of all currently married Jewish respondents indicate they have a non-Jewish spouse. Among those who have gotten married since 2010, 61% are intermarried.  That's higher than in Europe.  The closeness of our Jewish population is widening to the point of losing the Endogamous character today in the Dispora, though it is continuing in Israel. At least there, Ashkenazi and Sephardi marriages are happening along with mizrachim, giving the genes fresh partners.   

Resource;

https://uncoveringjewishheritage.com/tag/endogamy/#:~:text=Endogamy%20was%20very%20common%20among,DNA%20within%20Ashkenazi%20Jewish%20populations.

https://en.wikipedia.org/wiki/Marriage_in_the_Palestinian_territories#:~:text=Since%20at%20least%201959%2C%20polygamous,including%20the%20Jewish%20and%20Muslim.

https://en.wikipedia.org/wiki/Medical_genetics_of_Jews#:~:text=Diseases%20inherited%20in%20an%20autosomal,to%20hereditary%20nonpolyposis%20colorectal%20cancer

https://www.tabletmag.com/sections/news/articles/sefer-hasidim-rabbi-judah-of-regensburg-early-13th-c

https://www.law.cornell.edu/wex/polygamy#:~:text=Polygamy%20as%20a%20crime%20originated,Anti%2DPolygamy%20Act%20of%201882.

https://www.pewresearch.org/religion/2021/05/11/marriage-families-and-children/