A duchess in The Knight of the Parrot.
Hearing of Arthur’s exploits in the guise of the Knight of the Parrot, she declared her love for him. One of her suitors, the Knight-Giant, grew angry at this and promised to bring her Arthur’s right hand.
The Knight-Giant was slain in the battle, and his brother, the Redoubtable Giant of the Sure Keep, took revenge on Estrales by cutting of the hand of one of her ladies, the countess Bliandois.
Source
Le Chevalier du Papegau | Late 14th century or early 15th century