A character from Greek myth
encountered in one of the Labours of Hercules
. Geryon was the son of Chrysaor and Callirrhoe. Chrysaor had sprung from the body of the Gorgon Medusa
beheaded her, and Callirrhoe was the daughter of two Titans, Oceanus and Tethys. Geryon was pretty wacky looking (which might have had something to do with having a grandmother who had snakes growing out of her head.) He supposedly had three heads and three sets of legs all joined at the waist, which is hard to chalk up to bad diet or lack of exercise.
Geryon lived on an island called Erythia on the border between Libya and the European sub-continent. Hercules was sent out to steal Geryon's red oxen Eurystheus, the king of Tiryns and Mycenae. He sails to the island in a cup, bashes Geryon's dog with a club, shoots Geryon with arrows, and takes the cattle back to Greece.