Grastian the Castellan
A steward of King Ban of Benoic (Lancelot’s father). He took care of the city of Trebe in Ban’s absence. When Ban allied with Arthur, Gratian joined their struggle against the rebellious kings and Saxons, and he apparently became a Knight of the Round Table.
His son Banin was Ban’s godson and also a Knight of the Round Table.
Sources
Vulgate Merlin | 1220-1235
Le Livre d’Artus | Early 13th century
Arthour and Merlin | Late 13th century
Le Morte Darthur | Sir Thomas Malory, 1469-1470