Cerbura is a three headed infernal dog of the Krishna legend. and in the Gospel we read of Scorpions and Mammon and the prince of this world and rulers of darkness, of all which Beelzebub is the prince, whom Scripture calleth the prince of wickedness. Porphyrie [Porphyry] saith, their prince is Serapis, who is also called Pluto by the Greeks, and also Cerberus is chief amongst them, that three-headed dog: viz. Because he is conversant in three elements, air, water, and earth, a most pernicious devill; whence also Proserpina, who can do very much in these three elements, is their Princess, which she testifies of her self in her answers, in these verses. http://en.wikisource.org/wiki/De_Occulta_Philosophia/Book_3/Part_2