A maidservant of Lady Galiene of Lothian in Guillaume le Clerc’s Fergus.
She set out to find a champion when Galiene’s castle, Roucebourc, was besieged, but, upon arriving at Arthur’s court, found that most of Arthur’s knights were on a quest to find the absent Sir Fergus.
Arondele eventually located Fergus himself, who gladly agreed to serve as Galiene’s champion.
She is called Lunette in the Dutch Ferguut.
Source
Fergus | Guillaume le Clerc, 1200-1233