User blog comment:Zukofan/My thoughts on the meaning of The Great Prophesy/@comment-4424744-20111016100138

We know now that 6 of the Seven are Percy, Jason, Piper, Hazel, Frank and Leo. Number 7 is still unknown though. Keep in mind that both Jason AND Percy have storm powers, so it could be either. The oath could be refering to any of the oaths sworn so far, including Percy's oath on his life the Greeks won't attack the Romans from SoN. The Doors were hinted in SoN to be somewhere in Rome, and Gaea is everywhere.. Regardless we don't know who these "foes" are yet.