Quintefoille
A rich city distant from Britain.
Its lord perished, and his daughter was supposed to inherit the land. Her cousin, however, raised a counterclaim and stole the city from her. The lady traveled to Arthur’s court to find a champion, and Arthur decided to go himself.
The king and his company came to Quintefuelle after passing through several strange and dangerous lands. The king fought the duel himself, killed the lady’s cousin, and restored her to her throne.
Source
Les Merveilles de Rigomer | Jehan, mid to late 13th century