<p>No one knows of wlfhearth of Atmora, the Ash King, the Under King? Really? He was the ancient king from Atmora and avatar of Shor, who was brought back by him few times. He the one who rvealed to Hjalti, that he was dragonborn, before the battle of old Hroldan and taught him t'hum then. He was his eyes and ears on battle field when he was conqering Tamriel, but since he cannot appear to be in two places as one, Wulfheart worked behind the scenes. Yes, it suggests that Wulfhearth, was such a part of Talos, that they looked alike. Then he got angry with Tiber Septim, for not wanting to crush Dunmer, and left him. However, Tiber realized that he needs the avatar of Shor, to power Mantela, so he lured him back, with a promise of destroying elves of Morrowind. Instead, he trapped his powerful soul in Mantella. But that's where the different story of Zurin Arctus takes place, that before Wulfheart was trapped in the mantella, he killed Arctus. To explain what happened, the official records say, that battle mage turned on Tiber Septim and killed a valiant guard, who was trying to defend Emperor, before he was killed and his soul was trapped in the soul gem. Like that, the name of Wulfheart was replaced by Arctus and prety much forgotten. I think he was mean to be in the story, that pile of ash, that was left of Arctus. I think it also have something to do, with not wanting to stain the name of ancient, Atmoran king, with treason. Arcturian Herressy, might provide some answers, but not everyone will believe it, of course.
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