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 >>/33007/
 >>/33014/
 >>/33039/

> some noble family descended from Jews

It can be just a part of historical myth.

Religion, especially in past, wasn't separated from history, and concept of tracing your lineage from some religious figure was very popular. It is like translatio imperii applied to heritage.

For example, Romulus and Remus (both already mythological) were traced as descendants of Aeneas and so they were noble Trojans. Of course this wasn't original story, just a late influence of Greek culture.

Same with Christianity. When mainstream changed, people started to rewrite their founding stories to conform the new "true" history that was written in the Bible. So, Christian nations started to trace their history from some tribes of Israel, noble families - from famous biblical people etc.

It was pretty widespread thing, sometimes even too crazy:
https://en.wikipedia.org/wiki/British_Israelism
https://en.wikipedia.org/wiki/Japanese-Jewish_common_ancestry_theory

So, it isn't good to trust many sources about Jewish connection and nobility just because worldview in past was pretty different. And you always need to consider that these mythical ancestors were biblical "Jews", noble chosen people from legends, not contemporary (for medieval times) strange bearded people from isolated city communities, who didn't believe in proper Jesus. It doesn't even matter if David was real or not.