Board Thread:Lore Discussion/@comment-26103034-20150924214122/@comment-18750685-20150924220607

From as far as we can tell, there is technically no way for an ordinary Daedra to become a prince.

However, by looking at Tiber Septim, who became Talos the Divine, perhaps -- perhaps -- 'tis possible.

One could say the Hero of Kvatch became Sheogorath through Mantle, but we've yet to see any irrefutable evidence that he or she actually did; HoK wasn't Daedric, either.