Board Thread:General Discussion/@comment-159.20.16.131-20140324111541/@comment-1648085-20140417174243

1. No idea. It predates the series start by quite a few decades.

2 - 4. Yes, there are suggestions that Geass is quite ancient. In fact, it probably predates human history, given that sites exist all over the world, and imply that all humans are psychic. Not to mention the sphere city and dozens of Geass priestesses shown in the flashes during the Geass scenes. No real explanation exists.