A wounded knight encountered by Lancelot on his way to Rigomer Castle.
Brios had been injured at Rigomer, and was fated to never heal until a “faultless” knight examined his wounds. The story infers that Gawaine is this “faultless” knight, but Brios does not appear again in the story. Brios gave Lancelot some information about Rigomer.
Source
Les Merveilles de Rigomer | Jehan, mid to late 13th century