So i'm wondering if Attrebus Mede every became emperor, there is no record of it but titus mede i took power in 4E 22, and titus mede ii took power in 4E 168, also titus mede ii's aunt is alive and if his father was titus mede i then she would very old.
Probably mede seconds father or grandfather if i have my human lifespans correct with the 140 years between the book and skyrim, so i'd guess most likely nothing concrete one way or the other though.