A terrible giant who tried to kidnap lady Behalim of Semphrap but was stopped by her brother, Mahardi. Mahardi and Reimambram scheduled a duel to decide the matter, but Mahardi died before it could be fought. Gawain took his place, defeated Reimambram, and forced him to swear fealty to Behalim.
Source
Diu Crône | Heinrich von dem Türlin, c. 1230