Messiah via Chronomancy
From D&D Wiki
I'm curious,a supplement my friend owns has rules for chronomancy, or the magical manipulation of time. The 9th level spell of that branch allows pretty much unlimited travel into the past. If you went back to somewhere near the beginning of civilization, and planted rumors of your character coming as a messiah in the future, then popped up for worship every couple centuries or so, could you make yourself into a pseudo-god?