Beelzebub is the fallen angel / demon who is known as the "Prince Of Demons." It is also a contemporary name for the "Devil" in Christian tales. According to Catholic tales, he is one of seven princes of Hell. Another common name for Beelzebub is "Lord Of The Flies", and is described as a demonic fly. This may have a connection to a large amount of flies in a specific area in a home being a sign of demonic presence. "Jewish scholars have interpreted the title of 'Lord Of The Flies' as the Hebrew way of calling Ba'al a pile of dung and comparing Ba'al followers to flies." -(Jewishencyclopedia.com)
A common image that is associated with Beelzebub is :