User blog comment:Jack Pistol/Immortal Dovahkiin?/@comment-4113369-20121002165402/@comment-2040576-20121005131047

I believe in the times before St Alessia the Daedra and Aedra walked Nirn freely, but then Akatosh made the pact with St Alessia and gave her the Amulet of Kings, sealing off the Gates of Oblivion. Then of course the Oblivion Crisis happened. I am not entirely sure, but I think it goes something like that.