Board Thread:Lore Discussion/@comment-1600847-20130821212751/@comment-184.77.195.245-20130822201515

Keep in mind the Greymarch only happens once every era, usually at the end. So as far as we know Jyggalag was never killed he was simply warded off until the next Greymarch. My speculation is that Sheogorath was so fed up with having to destroy his land and rebuild it every era that he just wanted to give it up to someone else. However... I believe the Sheogorath from the Shivering Isles storyline is still Jyggalag and that the Hero of Kvatch is now Sheogorath and that Jyggalag was dismissed to the Void awaiting the next Greymarch to destroy the Shivering Isles. The next Greymarch will result in a battle between Sheogorath and Jyggalag because they are no longer the same person... or thing... In addition to this I also think that the original Sheogorath didn't think he'd be banished to the Void, instead he hoped that if Jyggalag was defeated he could actually roam the planes of Oblivion.

I could be very wrong though.