Root cause Thalmor heartburn problem #2Talos was the first Dragonborn emperor of Tamriel. As a brilliant battlefield commander, Talos's near supernatural feats of leadership and accomplishments were what led him to be revered as a leader when alive---and worshipped by mankind (especially by the Nords) as a deity after his death. While alive, Talos was the living embodiment of a demi God--none of the Aldmeri dared quarrel with him, because none could beat him on the battlefield. So if there was any resentment on the Aldmeri's part--as most certainly was the case---they suffered it in silence. With his death, Talos became the embodiment of mankind's independent spirit in Tamriel. His subsequent canonization grew into to the schism existing between the Aldmeri and men in present day Skyrim.
While Talos
IS a divinity, he was
NEVER a true immortal--because of his humble origins as a mortal man.
More specifically, Talos was NEVER one of the immortal progeny of Anu (the force of order, life, creation and stasis) and Padomay aka Sithis (the anti-thesis force of chaos, death, destruction, and change). These two fundamental deities were the original immortals who existed before the creation of time or the TES universe (aka Mundus) of which Tamriel (on the planet Nirn) is a part.
Anu and Sithis conceived numerous immortal progeny. So by default, their immortal offspring have existed since the beginning of time---eons before the mortal Talos was ever conceived in Atmora. These immortal progeny were called et'Ada or Original Spirits. The "positive" et'Ada were most like in nature to Anu, who represented the light--so they aligned with Anu. Similarly, the "negative" et'Ada were aligned with their father Sithis, who represented the void.
Mankind across Tamriel has historically referred to these two et'Ada groups as Gods and Demons. But the Mer have always referred to them as Aedra and Daedra, which in Aldmeri means "Our Ancestors". When the et' Ada were created, two of the oldest and most notable were Lorkhan and Akatosh.
According to the lore book called "The Monomyth" (http://www.uesp.net/wiki/Lore:The_Monomyth):
…When Akatosh forms, Time begins, and it becomes easier for some spirits to realize themselves as beings with a past and a future. The strongest of the recognizable spirits crystallize: Mephala, Arkay, Y'ffre, Magnus, Rupgta, etc. Others remain as concepts, ideas or emotions. One of the strongest of these, a barely formed urge that the others call Lorkhan, details a plan to create Mundus, the Mortal Plane….
So Akatosh is the eldest of the et'Ada, and his creation was what allowed his other et'Ada siblings to form a sense of consciousness and materialize. One of his most notable siblings was Lorkhan, whose Sithis/Anu alignment is still debatable depending on the Man or Mer perspective. Lorkhan was responsible for convincing (man's view)---or "tricking"(Aldmeri view)---some of his et' Ada siblings into sacrificing significant portions of their immortality to create Mundus. This is the TES equivalent of our Milky way galaxy and universe, of which the planet Nirn is a part. Nirn predominantly consists of the Tamriel continent.