The fullest account we have of Oannes is found in surviving fragments of the works of a Babylonian priest called Berossos who wrote in the third cent… - Graham Hancock

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The fullest account we have of Oannes is found in surviving fragments of the works of a Babylonian priest called Berossos who wrote in the third century BC. [...] Oannes did not do his work alone but was supposedly the leader of a group of beings known as the Seven Apkallu — the "Seven Sages" — who were said to have lived "before the flood" (a cataclysmic global deluge features prominently in many Mesopotamian traditions, including those of Sumer, Akkad, Assyria and Babylon). Alongside Oannes, these sages are portrayed as bringers of civilization who, in the most ancient past, gave humanity a moral code, arts, crafts and agriculture and taught them architectural, building and engineering skills.