2493. Imortus

Immortus (Nathaniel Richards) is a fictional character in the Marvel Universe. He is the future (and later, alternate) self of Kang the Conqueror, and first appeared in Avengers #10, and was created by Stan Lee and Jack Kirby.
At some point in his personal timeline, Kang became weary of battle, due to frustration and the loss of his son Marcus and consort Ravonna in several timelines. He was approached by the alien Time-Keepers — time travelers from the end of the universe, the last living creatures in existence — to become their agent, preserving timelines rather than conquering them in exchange for immortality. He accepted and reinvented himself again, this time as Immortus, the lord of the other-dimensional realm of Limbo.
He again came into conflict with the Avengers, but under different circumstances. In his first encounter with the Avengers as Immortus, he attempted the destruction of the Avengers through the use of mythological figures as combatants after trying to join the Masters of Evil. The Masters attacked the Avengers after Captain America had been taken to 1760 the Tower of London where Rick Jones was imprisoned. But when he rescued Rick he was returned to his own time and with his help the Masters were defeated at a near-win. This event was apparently erased after the Enchantress turns back time to prevent the Avengers capturing the Masters. He was partially responsible for the creation of the Vision, allegedly creating a temporal copy of the original Human Torch that the android Ultron used to create the Vision.
Later, he even allied with Kang the Conqueror in one of Kang's schemes against the Avengers. However, he was betrayed by Kang, and imprisoned while Kang utilized Immortus's advanced technology to create the first Legion of the Unliving, made up of now-dead characters taken milliseconds before their death. He was subsequently freed by the Avengers, and revealed to be the future persona of Pharaoh Rama-Tut and Kang the Conqueror. He offered to aid the Vision in learning his past. The Legion of the Unliving were defeated and sent back to their own times, and Kang fled.