Two entries with the name White Forest.
White Forest
An enchanted forest near Arthur’s court at Cardueil. It contained the Chapel of St. Augustine, which renewed Arthur’s spirits. It was also the haunt of the evil Black Knight, who was slain by Arthur.
Source
Perlesvaus | Early 13th century
White Forest
A wood inhabited by the White Knight. Arthur challenged the White Knight for ownership of the forest. In judicial combat, Sir Meriadoc decided the issue in Arthur’s favor, but persuaded Arthur to relinquish his claim.
Source
Historia Meriadoci Regis Cambrie | Late 13th century
See also
Colored Characters | The Legend of King Arthur