A Knight of the Round Table from Germany. He was a cousin to the sons of Urien.

He fought in Arthur’s forces during the Saxon Wars. During the Grail Quest, while adventuring with Gawain, Yvain ignored a warning and brashly entered a castle, where he was burned alive to avenge the death of Lamorat, who had been killed by Gawain. Yvain’s sister, who blamed Gawain for Yvain’s death, tried to have Gawain killed but failed.