He is the king of the west according to some translations of The Lesser Key of Solomon and king of the south according to Pseudomonarchia Daemonum. The other three kings are Amaymon, Ziminiar and Gaap (although some translations of The Lesser Key of Solomon consider Belial, Beleth, Asmodai and Gaap, not giving detail on the cardinal point they rule)
Other spelling: Gorson.