NIGHTBRINGER | The Arthurian Encyclopedia

Butocostiaus

Botincoutiaus, Boutincostiaus, Buticostiaus

The lord of Finecoce and one of four Irish robber knights defeated by Lancelot on his way to Rigomer castle.

Lancelot sent him to Guenevere as a prisoner.


Source
Les Merveilles de Rigomer | Jehan, mid to late 13th century