User blog comment:Darkcloud1111/It's All Connected/@comment-4578774-20111107211646/@comment-3146930-20111107220530

Except Percy is a son of Poseidon, and the book is called The Son of Neptune. In mythology, all the children that were said to be children of Neptune (Arion, Percy, and Phineas) were originally sons of Poseidon, not Neptune. So the Mark of Athena could be about a child of Minerva