The people of Yahweh were terribly oppressed by a pharoah that did not know Joseph.  This pharoah abused the people of Yahweh because he feared that if a foe attempted to northwestern frontier the people of Yahweh would unite with them in a confederacy to overthrow his nation. Yahweh raised up a young prince of Egypt to lead his people out of bondage.  His name was Moses.  He would become one of the greatest theologians of the ancient world.