Four entries with the name Yvain.
Le Chevalier au Lion, The Knight with the Lion
I prefer to separate him from other Yvains by spelling his name Ywaine.
A Knight of the Round Table who was the son of King Hervi.
Found in the romance of Yder, he may be identical to the original Yvain, with “Hervi” being a corruption of “Urien.”
Yder | Early 13th century
Yet another of Arthur’s knights, variously called “the Crooked,” “the Buck,” “the Deer,” and “the Shining.”
Lancelot do Lac | 1215-1220
Vulgate Lancelot | 1215-1230
Vulgate Merlin | 1220-1235
Arthour and Merlin | Late 13th century
A knight in Arthur’s service who was the son of the Soumière.
Les Merveilles de Rigomer | Jehan, mid to late 13th century