What role did King Bans of Brittany and King Bors of Gaul play in the rebellion against Arthur

Sir Bors was the only knight to survive the Quest for the Holy Grail and return to court. His fathers name was Bors, and he later succeeded his father as King of Gannes. Bors was a chaste knight, but the daughter of King Brandegoris fell in love with him, and with the aid of a magic ring forced Bors into loving her.

As a result of this union, Bors became the father of Elyan the White, later Emperor of Constantinople. Bors undertook the Quest for the Holy Grail along with Galahad and Percivale. Bors was the only one of the three to return to Britain, and after the Quest, he returned to Arthur's Court.

Bors was the cousin of Sir Lancelot, and he steadfastly supported him against Arthur during the conflict between the two. After the death of Lancelot, Bors returned to the Holy Land where he died fighting in the Crusades. It has been suggested that, in origin, Bors may have been a character who figures in Welsh legend as Gwri.