Pryderi was the son of Pwyll, the lord of Dyved, and of Rhiannon. Pryderi was the only characters to appear in the four tales of the Mabinogi.
In the tale of Pwyll, Pryderi was abducted when he was only an infant. In the story of Branwen, he was a young man who ruled his father's kingdom; however, his role in this story was minor. This tale was about the war between
In the tale of Manawyddan, Pryderi had more active role than all the other tales. Pryderi returned to
In the final tale, called Math Son of Don, Pryderi appeared only in the first part of the tale. Gwydion, nephew of King Math of Gwynedd (northern kingdom) and a great sorcerer, had cheated him by stealing his pigs. These pigs was given to him, by Lord Arawn of Annwfn (Otherworld), who was a close friend of his father Pwyll. To avoid a battle, Pryderi agreed to a single combat against Gwydion, in which Pryderi lost his life.
In a way, the four tales of Mabinogi was a Cycle of Pryderi, yet he only played a minor role in each of story. Pryderi also appeared in a Welsh tale, called Preiddiau Annwfn (Spoils of Annwfn), where Arthur tried to steal a magic cauldron in Annwfn (Otherworld). Again, Pryderi was one of the seven survivors, along Arthur and Taliesin. (Hey! This sounds familiar to the tale about Branwen.)