Beelzebub, derived from the Hebrew בַּעַל זְבוּב (Baʿal Zevuv), meaning 'lord of flies', is a name historically associated with a Philistine god. It is believed to be a mocking alteration of בַּעַל זְבוּל (Baʿal Zevul), meaning 'Ba'al of the exalted house'. In Christian theology, Beelzebub is often identified as a major demon or fallen angel, and is considered Satan's chief lieutenant in some traditions, notably in John Milton's 'Paradise Lost'.