The younger daughter of Lord Lamuire of Serre, who died without a male heir.
Sgoidamur’s sister, Amurfina, feuded with her over the rights to their father’s land, which was embodied in a magic bridle that Amurfina obtained. Sgoidamur complained to Arthur’s court for redress, and Gawain vowed to restore Sgoidamur to her inheritance.
During the quest, however, he married Amurfina. After some consequent complications, Gawain arranged for Sgoidamur to marry Gasozein of Dragoz, a noble knight.
Gawain champions a (unnamed) maiden in a similar plight in La Mule sans Frein.
Source
Diu Crône | Heinrich von dem Türlin, c. 1230