A historical sixth-century king of Gwynedd mentioned in several Welsh texts. The Latin version of his name is Maglocunus ('Hound Prince'), and a certain "Maglocune" is berated by Gildas in his De Excidio Britanniae. The Annales Cambriae says that he died in 547 from the plague.
In The Mammoth Book of British Kings and Queens by Mike Ashley, he is listed as homosexual.
Gildas listed Maelgwyn amongst his five tyrants, calling him "first in evil" and stating that he was "drunk on wine pressed from the vine of the Sodomites". Geoffrey of Monmouth was more specific, stating that he "made himself hateful to God, for he was given to the vice of homosexuality." Maelgwyn was a tall handsome man who also had his way with the ladies, for Gildas also reprimanded him for being an adulterer.