Board Thread:Online Discussion/@comment-12.109.215.53-20140509032520/@comment-24261859-20140514064727

Doubtful. Tiber Septim was a Breton (I think, might have been a Nord) but Vestige could be any race. Also, there's no real evidence to support any similarity, as a) The Vestige is not dragonborn, and b) Tiber Septim has an established history, one that is not related to the story of ESO.