Hjalti Early-Beard was born in Alcaire, High Rock. At least one of his parents was a Nord (evidenced by his Nordic name and the fact that you can find people of any race in any province, especially in the chaos of the 2nd era), or he was adopted by Nord parents. He learned how to fight from the sword-masters of Alcaire along with a close Nord friend (as told in the TES VI: Skyrim Misc quest The Ghost of Old Hroldan). When Hjalti is in his late teens/early twenties, he leaves High Rock and goes to Skyrim for some reason (maybe just to seek his fortune). There he is summoned by the Greybeards (in a way similar to how the player is summoned in TES VI) who reveal his identity as dragonborn and name him Ysmir, Dragon of the North, as per Arngeir's dialogue in TES VI (he either learns some shouts shortly before this from Nord Chieftains or learns shouts and his status as dragonborn all at once). They tell him he will unite Tamriel, but must go south to do so. His first big act after learning his destiny is to take Old Hrol'dan back from the Witchmen of High Rock for the Nords. His use of the voice to win causes him to be dubbed Talos (meaning Stormcrown in Atmoran) by the troops under his command. During the battle, his old friend from Alcaire dies, never having heard Hjalti's new title. Hjalti, now known as General Talos, now enters the service of Emperor Cuhlecain, and assumes the throne of Cyrodiil after Cuhlecain's death (who he probably did assassinate, but also it could really have been a nightblade). He (again) gives himself a new name, Tiber Septim, which he will be called until his death. He conquers the rest of Tamriel using the Numidium, and either betrays or is betrayed by his Imperial Battlemage, Zurin Arctus. The Numidium is destroyed (for the first time) and Zurin becomes the Underking. Hjalti Early-Beard a.k.a Ysmir a.k.a General Talos a.k.a Tiber Septim rules Tamriel for 81 years, and era of unprecedented peace and prosperity for all its peoples. When he dies in 3rd Era 38, his great works and status as dragonborn cause his soul to accend into Godhood, and he becomes the Divine Talos. Just as all the aedra embody an essential aspect of Mundus or it's people, Talos represents strength, honor and courage, which all mortals can have.

Malacath could not have summoned the "ghost" of Alduin as he was NOT DEAD, having instead been transported through time by Felldir the Old using an elder scroll. Also, the "Five Songs..." is a very unreliable source. As stated above, Malacath could not have possibly summoned Alduin's "ghost" and Alduin could not eat away time itself, as he would have done so if he could during the main questline of TES V. I just as Alduin's legend was built up over the ages, going from the most powerful dragon to Akatosh himself, I think that King Wulfharth's story grew distorted over time. In all likelihood, Wulfharth was just a very powerful tongue (and possibly also a Dragonborn) who became King of Skyrim and then died ONCE, at the Battle of Red Mountain in 1st Era 700. Ysmir is, I think, just a traditional title given to Dragonborn, based on the Greybeard's greeting of the Dragonborn after he has completed their trials in TES V.