Berossus or Berosus was an early-3rd-century BC Hellenistic-era Babylonian writer, priest of Bel Marduk, and astronomer who wrote in the Koine Greek language. c. 400 BC – c. 300 BC; died at about 100. Alive at the same time as Aristotle, Alexander the Great, Archimedes, Apelles, and Euclid. Wiki link