You are a Greek God of Olympus and your older brother is Poseidon and you knew that he had a half-blood son in the land of mortals. Since Percy was born you protected him but you couldn't be present before him since it was forbidden.

You always protected him with your powers from Olympus, especially when you saved him from the chimera. The day Percy arrived at Olympus to talk to his father for the first time, there you were.

"I know you?" He asked confused while looking at you.