User blog comment:Gingergreeney/Idea/@comment-4662873-20120129164815/@comment-3146930-20120130215948

ya, Poseidon and Zeus both broke the oath. Hades already had children when the oath was made, so he never broke it. As far as Hazel goes, we dont know if the god's Roman forms have a similar oath. I personally dont think they do as the Great Prophecy was given by the Greek oracle and was brought about by the children of Zeus, Poseidon, and Hades fighting (the cause of WWII)