Rama-Tut was a pharaoh of ancient Egypt and the predecessor of Apocalypse.
In ancient Egypt, Rama-Tut was a powerful pharaoh who was said to "have been given great powers by the gods". In reality, Rama-Tut wielded highly advanced technology that enabled his absolute rule. When words from the wilderness of a great warrior rose, Rama-Tut dispatch his armies to crush the upstart. However, the warrior, En Sabah Nur, defeated his would-be-assassins and raised a larger army against the pharaoh. Rama-Tut was subsequently overpowered and overthrown by Nur, who would became known as Apocalypse.
In Marvel Comics, Rama-Tut is one of many identities assumed by the time-traveler commonly known as Kang the Conqueror, who has also been known as the Scarlet Centurion, Immortus the master of Limbo, and the Young Avenger Iron Lad (Kang's younger self attempting to rebel against his 'destiny').