Carsalas
A knight who stole a stag’s head and brachet from Perceval while Perceval was fighting the Knight of the Tomb, Garsallas’s half-brother. Perceval later encountered and defeated him, and sent him to Arthur’s court.
Garsallas’s father was the duke of Geneloie, and his paramour was named Riseut.
Source
Second Continuation of Chrétien’s Perceval | Attributed to Wauchier of Denain, c. 1200