User blog comment:CardMaster2412/Seven Half Bloods Parent and Identities/@comment-4354821-20110830065054/@comment-3459279-20110830214902

that is possible, from what I remember (and my memory could be wrong) one of the gods mentioned that when Zeus first defeated Kronos he, like all other monsters, was sent to Tartarus...presumably because a) it took him a hell of a long time to get high enough in Tartarus to influence the world, and b) he was really recently defeated without fully reviving, I think he just got sent back, just as far, or further, than before