[golergka]

My family history, for example, have always seemed weird in that regard. Genealogy up until 11-12th century is pretty straightforward and documented, with notable rabbis and doctors, but then it jumps straight to legends and familiar family names from antiquity, without any information from Dark Ages straight out missing from any records. And other old Jewish families I know are very similar: all genealogical information just vanishes for these centuries, even if there are older reliable sources picking up the story from antiquity and beyond.