What would happen if Sally died when Percy was six? What would happen if Poseidon decided to raise him on Olympus? How will this change the story? Percy Jackson, started to get attacked when he was four years old. When he was six years old, his mother got killed the Minotaur, who Percy killed later, but it was to late, the deed was done. His mother Sally Jackson was dead. Seeing this, Poseidon went against ancient laws, and convicted the other Olympians to do the same and raise the young half-blood on Olympus. The Olympians were him teachers, teaching how to fight so one day he could fight along, with the gods. When the time came.