Board Thread:General Discussion/@comment-74.196.223.125-20130804060138/@comment-98.214.97.246-20140516043841

Rune couldn't be a Septim anyway because the Dragonfires would've remained lit had their been a missing heir to the throne. It wasn't until Martin died that they finally went out, formalizing the end of the Septims. Because he was found with a stone that supposedly has a different language on it, I'd like to believe that he's either from Akavir, Atmora, or possibly Artaeum. The last one being very unlikely since the Psijics are primarily formed of Altmer.