Satan discovers Beelzebub, his next in command, lying next to him in Paradise Lost by John Milton.
Beelzebub was the Lord of the Flies, one of the Fallen Angels and Satan's second in command. Beelzebub is the name that one of the Syrian gods received. He is mentioned in the Hebrew Bible. He is the first with whom Satan confers when contemplating rebellion and he is the first Satan sees when they are in hell.
