In Against Apion, Josephus and Apion discussed
the record of Egyptian historian Manetho.
Manetho recorded two different groups leaving
in the 16th century BC. The first was much
larger, in the hundred thousands. They left
willingly. The second group, led by an Egyptian
priest named Osarseph who changed his name
to "Moses," was driven out by force and mostly killed. (may 10, 1600 BC – may 10, 1500 BC)