Board Thread:Lore Discussion/@comment-85.74.137.231-20130605091958/@comment-10207438-20131102182434

technically Potema would be the successor, because, again technically, The Mede Dynasty is more of a continuation of the Septim Empire than it is a new empire; she would have the legal right to become empress, but there would probably be a civil war within cyrodiil based on whether it is right to put her on the throne just because she's a direct decendant of the 'true' emperor of tamriel.

I would also assume many Necromancers and Daedra worshippers would join her side.