Osarseph is a semi-mythical figure in the history of Ancient Egypt who has been equated with Moses. His story is recounted by the Jewish historian Josephus, in his book "Against Apion". Josephus quotes from the now-lost writings of the Ptolemaic Egyptian historian Manetho (writing in the third or fourth century BC). According to Josephus, Manetho described Osarseph as a tyrannical high priest who rose to power during the reign of Pharaoh Amenhotep. Wikipedia
The definitive Wikipedia entry for Osarseph. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Osarseph