The Jewish diaspora in Roman times and Late Antiquity was not just a scattering of people from the Land of Israel. Geographical, cultural, religious and language differences resulted in two distinct diasporas—western and eastern—which helps explain why Paul went west from Jerusalem.

052 It seems like almost everywhere archaeologists dig in the eastern Galilee these days, they are coming up with ancient synagogues. In 2007, a third–fourth-century C.E. synagogue with beautifully decorated mosaic floors depicting Biblical...