Beelzebub

The Lord of the Flies Beelzebub, a former Seraph turned high-ranking Archdemon, is considered one of the Seven Kings of Hell and oversees the Order of the Fly. He, alongside Satan and Lucifer, form the Triumvirate of Hell and is additionally one of the Supreme Monarchs of the Inferno. Beelzebub was an angel, more specifically a Seraphim, who was once under the Archangel Gabriel and revered as a Philistine deity named Baal Zebul. Either way, Beelzebub fell and joined with Lucifer to become a high-ranking demon in Hell.