A kingdom mentioned in several German texts, probably a variation of Gales or Wales, although Wirnt von Grafenberg, in Wigalois, seems to place it in the Middle East.
It’s king, Roaz, was killed by Wigalois (Gawaine’s son).
See also
Ruel | The Legend of King Arthur
Source
Wigalois | Wirnt von Grafenberg, early 13th century