Nathaniel Richards is a time-traveling nemesis of the Avengers.
Kang was born on Earth during the 30th century of a parallel reality. He wished to become the "Master of Time," and many times faced a team from his reality known as The Avengers. His nickname was The Conqueror. (TNG comic: "Second Contact")
Kang the Conqueror is one of the main antagonists of Contest of Champions and a Cosmic type Champion.
The history of the time-traveling supervillain Kang the Conqueror, is a complex one. He began as Nathanial Richards, hundreds of years after the mainstream Marvel Universe takes place. The technology in his day was extremely advanced, giving him time traveling capabilities.