carry the Ji (ancient Jewish) haplotype. Of those who really DID flee, most of the descendants are in Yemen. That's why 76% of Yemenites carry the J1, but only 16% of Ashkenazim. Europeans did not convert in significant numbers until the 8th c. We've only had this technology for about 20 years, but we CAN trace one's mDNA millenia in the past.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)