"He was born in Atmora under the name Talos, meaning Stormcrown in the old Ehlnofey. He spent his youth in Skyrim, where he learned the ancient art of the Tongues as well as the strategies of war from the chieftains there. At the age of 20, he led the invasion of Old Hrol'dan, taking it back from the Witchmen of High Rock. Soon after, growing storms made it known that the Greybeards were about to speak. As nearby villages were being evacuated, Talos traveled up the mountains the Greybeards called home, where they removed their gags and spoke his name, causing the World to shake. The Greybeards told Talos that he would come to rule Tamriel, but he must go south to do so.
Talos became General of the Colovian Estates under King (and later Emperor) Cuhlecain. General Talos met the combined army of Skyrim and High Rock on the field of Sancre Tor, who were hostile to Cuhlecain. The Skyrim army joined him when they saw him use the thu'um and knew him to be the son of Skyrim and heir to the Empires of Men. But the Bretons saw things differently. The general was almost killed in 2E 854 by a High Rock nightblade who managed to slit his throat and kill Emperor Cuhlecain. Although he could no longer use the Voice, he went on to command Tamriel with a whisper. He took the Cyrodilic name Tiber Septim, as well as "Ysmir, the Dragon of the North", the Nordic Name of Kings (also called more simply "Ysmir, Dragon of the North". Tiber Septim died in 3E 38." (http://www.uesp.net/wiki/Lore:Tiber_Septim)
While I highly doubt you read all that, if you do you will find some intriguing similarities between Tiber Septim and what we know about our character in Skyrim. Are these similarities simply drawn from the fact that they are both Dragonborn, or could there be something deeper? I'll be honest, the first thing that popped into my head was the possibility of Tiber Septim being reincarnated.
Call me crazy....maybe I'm losing my mind because I want to play this game so badly. Anyway, fire away with your comments. Is this plausible, or no?