Ruiel, Ruoel
A vicious, hideous hag who inhabited the woods of Glois. Her husband, Feroz, was murdered, which drove her to seek revenge on any knight she saw.
One such knight was Wigalois (Gawain’s son), who came to Glois on an adventure. Ruel charged him, and he didn’t defend himself immediately because she was a woman. Surprising him with her might, she bound him and carried him off like a sack. As she was about to cleave off his head, his horse whinnied. Hearing the noise, Ruel thought that Pfetan, the local dragon, was coming, and she fled, allowing Wigalois to escape.
Source
Wigalois | Wirnt von Grafenberg, early 13th century