This is what was posted in a writeup about the new Elder Scrolls book and once all of us nerds got excited about it, they yanked it off.
"A novel that takes places forty-five years after the Oblivion Crisis, which is the story of The Elder Scrolls IV: Oblivion game and the expansion pack Shivering Isles. It partly bridges the gap for the next game, which is set 200 years after the Oblivion crisis."
I'll be honest you guys, I've only played Morrowind and Oblivion. I keep wanting to pick up the others but just never had time.