Alexandria (c. 300 BC) was not only a center of Hellenism, but was also home to the largest urban Jewish community in the world. The Septuagint, a Greek version of the Tanakh, was produced there. Book of Enoch, a Hebrew version of the Greek, was produced there. The early Ptolemies kept it in order and fostered the development of its museum into the leading Hellenistic center of learning (Library of Alexandria), but were careful to maintain the distinction of its population's three largest ethnicities Greek, Jewish, and Egyptian. By the time of Augustus, the city walls encompassed an area of 5.34 km2, and the total population in Roman times was around 500–600,000.

Euclid the 1st Enoch.