Akhenaten

Akhenaten was a Pharaoh who was chosen by the Celestials to be empowered with powers surpassing those of many cosmic entities - he was meant to use this power to recruit others for the Celestials (in a similiar manner to a Herald), instead he decided to use his newfound godhood to destroy all the gods and heroes of Earth in order to rule it as a supreme being.

Ironically it was Thanos who would come to Earth's aid and through the use of the Heart Of The Universe easily defeated Akhenaten.