What name does Berossus give the flood survivor who built the ark?

Berossus gives the flood survivor the name Xisuthros. Berossus was a Babylonian priest who wrote a Greek-language history of Babylonia in the Hellenistic period, probably in the third century BCE.

His account survives mainly through later writers, especially Alexander Polyhistor as quoted by Josephus and Eusebius. In the story, the god Cronus warns Xisuthros of a coming flood, and Xisuthros builds a large vessel to preserve people, animals, and provisions. After the flood, the survivors leave the vessel and the story includes birds being sent out to test whether the waters had receded.

Xisuthros is the Greek form associated with the Babylonian king Ziusudra. He is therefore related to, but not identical in name with, Utnapishtim from the Epic of Gilgamesh or Atrahasis from another Mesopotamian tradition. The account is a later classical report of Babylonian flood lore.