Sumarang is the antagonistic warrior of Biag ni Lam-ang, a rival the hero meets on the road as he journeys to court Ines Kannoyan. Boastful and hostile, he bars Lam-ang's way and challenges him; in the ensuing duel Lam-ang overthrows and kills him, one of the trials the hero surmounts before reaching Kalanutian. His name resonates with the Ilocano verb sumarang, 'to oppose or bar the way', fitting his narrative role as obstacle.