The Battle of Arfderydd (also known as Arderydd) was fought, according to the Annales Cambriae, in 573. The opposing armies are variously given in a number of Old Welsh sources, perhaps suggesting a number of allied armies were involved. The main adversaries appear to have been Gwenddoleu ap Ceidio and either the princely brothers, Peredur and Gwrgi, or King Riderch Hael of Strathclyde. Gwenddoleu was defeated and killed. His bard, Myrddin Wyllt, went mad and ran into the forest. He is probably the original of the Arthurian character, Merlin.