While the temple in Jerusalem was the iconic center of life for Jewish people in the Second Temple Period, it’s not very well known that there where other Jewish temples that existed alongside and in contrast to the Jerusalem temple. Although a lot isn’t known about these other centers of worship, they included the anti-Jerusalem Samaritan Temple; a temple in Egypt’s Persian era at Elephantine that may have worshipped more gods than just Yahweh; and the very historically problematic Oniad dynasty temple allegedly in the Egyptian city of Leontopolis, mentioned in the writings of Josephus and 2 Maccabees.
Meron M. Piotrkowski’s Priests in Exile: The History of the Temple of Onias and Its Community in the Hellenistic Period attempts to unravel the mystery surrounding the Oniad movement and fill in the many gaps in the historical record, about which there are many academic arguments. If this sort of thing excites you then mosey over to Ancient Jew Review for Miguel Vargas’s lengthy and interesting review of Priests in Exile: The History of the Temple of Onias and Its Community in the Hellenistic Period