Sir Blamore is the son of Nestor, brother of Sir Bleoberis de Ganis, cousin of Lancelot, and a Knight of the Round Table. Of the two brothers, Blamore was accounted the better man of arms. Blamore and Bleoberis once arraigned King Anguish of Ireland for the death of a cousin of theirs. Blamore was the one who fought the actual trial by combat against Anguish's champion, Sir Tristram. Defeated, Blamore tried to insist on death rather than surrender. Bleoberis seconded his brother's request, but Tristram and the judges refused to allow it. (La Tavola Ritonda assigns this adventure to a knight named Brunoro.)