Percy Jackson: The Monarch

I went to seek Athenas permission to marry her daughter and she trapped me on the Island of the Banished. A place where the Olympians have banished everyone they didn't want the world to know about, the moment the person is trapped here, they are forever wiped from history forgotten by abyone who knew they exited. Now years later he's given a mission by the creator of the universe go back in time and overthrow the Olympian Gods and become the new ruler, the Monarch. But there's more to it than that. Percy must also stop a man named Cyrus Grant from becoming the destructive force known as Armageddon.