"co-monarch, Beelzebub. The Lord of the Flies"
Beelzebub, translated as "Lord of the Flies," is an ancient Philistine deity interchangeable with the god Ba'al. He is one of the seven princes of Hell, and "Beelzebub" is sometimes used as another name for Satan himself.
Find more information about Beelzebub at the Catholic Encyclopedia and Jewish Encyclopedia.