Prince Gwydion Son of Don was a mighty warrior and minor enchanter in The Chronicles of Prydain. Gwydion met Taran of Caer Dallben while the Assistant Pig-Keeper was searching for the oracular pig Hen Wen, whom Gwydion also sought. Bearing the title "Prince of Don" and the surname "Son of Don", Gwydion rode a white mare named Melyngar, and carried the legendary sword Dyrnwyn after it was given to him by Princess Eilonwy. He was one of the Sons of Don, kin to High King Math and to Fflewddur Fflam, and a resident of Caer Dathyl.