Board Thread:Lore Discussion/@comment-8248675-20130606043855/@comment-13446185-20130808180918

Well because Tiber was raised by Nordic Jarls he must have been of some type of noble birth. But if he's Nordic there is very little chance that he was actually a noble in Alcaire. This leads me to believe that Tiber Septim might have been a bastard of one of the nobles in Alcaire.