The name given by Heinrich von dem Türlin to a maiden at Arthur’s court who could not laugh until she beheld the best of knights. When Perceval arrived at court, she broke into gales of laughter, foretelling Perceval’s successes.
Wolfram von Eschenbach calls her Cunneware, the Post-Vulgate names her the Mute Maiden, and she appears in Chrétien de Troyes’s Perceval unnamed.
Source
Diu Crône | Heinrich von dem Türlin, c. 1230