Board Thread:Lore Discussion/@comment-27657348-20160122192120/@comment-26357188-20160313055744

This theory doesn't work, because if anything your character from Oblivion most likely did become Sheogorath via mantling, and elements of Sheograth's and the Hero of Kvatch's personalities were combined. This is seen during the quest in Skyrim where you get the Wabbajack, where Sheogorath makes many references to the Hero of Kvatch's experiences in Oblivion.

I don't think that Sheogorath would be 2 places at once, and there is really only 1 vague reference that you mentioned that links Cicero to the Hero of Kvatch. In fact, the only other reference that Cicero has to Oblivion is found in his journals where he assassinated the Grand Champoin of the Arena in the woods by disguising himself as an adoring fan (this obviously isn't the adoring fan in Oblivion however, as he is a Bosmer and Cicero is a Breton). It is a more likely theory however, that Cicero might have been influenced by Sheogorath since he was afflicted with madness.