Caulas, Talac, Tallac, Taulas
A castellan and vassal of Arthur who rebelled against the king in Yder.
In response, Arthur besieged his castle of Rougemont. Sir Yder, who had become disillusioned with Arthur, joined Taulat and the defenders. During the battle, Yder was severely wounded by Kay. This wound dismayed both Arthur and Taulat so much that they reconciled and ended the battle.
According to the Vulgate Merlin, Taulat was later killed by some Knights of the Round Table, prompting his uncle Helys to attack all knights.
Source
Yder | Early 13th century