'Let my people go!' That's what Moses requested from Pharao. He was there to release the Hebrew slaves in the name of the God of the Israelites.
The story of Moses is quite extraordinary. He was the son of a slave, became the prince of Egypt, but also an outlaw. Then God called him, somewhere in the middle of the desert. God used a burning bush, can you imagine?
We know a lot about the story of Moses. It's part of the origin of the people of Israël. Start reading about this in Exodus 1. Take your time, it's quite a story!