Brother of the Knight-Giant, a knight killed by Arthur in The Knight of the Parrot.
He attacked Arthur in a forest to avenge his brother’s death. Arthur defeated him. As his brother had died trying to prove his valor to the Duchess of Estrales, the Redoubted Giant took vengeance on this woman by cutting off the arm of one of her ladies, the Countess Bliandois.
Source
Le Chevalier du Papegau | Late 14th century or early 15th century