Asmodeus

Asmodeus was an ancient demon lord who formerly ruled over the Infernal Planes.

History
Asmodeus ruled over the Infernal Planes until Mephistroth and Makuta Ynot worked together to enslave the eredar and place Mephistroth on the infernal throne instead.

Trivia

 * Asmodeus was named after a Biblical character of the same name who also ruled over demons in a version of Hell.