Gladoains
In Perlesvaus, a good knight from the Isles of Mores.
He assisted Lancelot when the latter was attacked by four knights at once. Upon receiving a wound, he left the battle to find help, returning with Gawain. He perished of his wound. In return for his service, Lancelot helped Gladoain’s brother, the Knight of the Green Shield, expel an invader from Gladoain’s castle.
He is also listed a knight of Arthur’s court and a companion of Gawain in Les Merveilles de Rigomer.
Sources
Perlesvaus | Early 13th century
Les Merveilles de Rigomer | Jehan, mid to late 13th century