Lady of the Fair Hair
Arthur’s paramour in Le Chevalier du Papegau. The Lady was the fairy sovereigness of the Amorous City.
She was plagued by a horrible creature known as the Fish-Knight. Arthur slew the monster after the Lady’s servant, Beauty Without Villany, came to Arthur’s court looking for assistance.
The Lady of the Blonde Hair fell in love with Arthur, but angered him by making him promise to act as “the worst knight in the world” during a tournament at her castle. Arthur was so furious at this humiliation that he beat the Lady. Later, the two made up and became lovers.
Source
Le Chevalier du Papegau | Late 14th century or early 15th century