What is known about Muhammad's early life?

Not much is known about the early life of Muhammad. When pregnant, his mother was told she was to deliver the lord of the Arabs. The grandfather took the newborn to Ka'aba and was told he would be a great man. There are many stories surrounding Muhammad's youth but none is documented. He was orphaned at an early age and his grandfather died when he was eight so he lived with his uncle. A monk told his uncle to protect him because he had the mark of prophecy between his shoulder blades.