Berosus, the Chaldean

Berossus () or Berosus (; Ancient Greek: Βηρωσσός, romanized: Bērōssos; possibly derived from Late Babylonian Akkadian: 𒁹𒀭𒂗𒉺𒇻𒋙𒉡, romanized: Bēl-reʾû-šunu, lit. 'Bel is his shepherd') was an early-3rd-century BC Hellenistic-era Babylonian writer, priest of Bel Marduk, and astronomer who wrote in the Koine Greek language. His original works, including the Babyloniaca (Ancient Greek: Βαβυλωνιακά), are lost, but fragments survive in some quotations, largely in the writings of the fourth-century AD early Christian writer Eusebius. Berossus has recently been identified with Bēl-reʾû-šunu, a high priest of the Esagila Temple in the city of Babylon, as mentioned in a document from 258 BC.