Gonzalo Martínez de Oviedo
Gonzalo Martínez de Oviedo (died 1340) was a nobleman from Oviedo who rose at the court of Alfonso XI of Castile as chief steward of the royal pantry. In 1337 the king pressed the Order of Alcántara to elect him master, an irregular choice.
Defying a royal summons, he fled to Valencia de Alcántara and offered the Order's border towns to Portugal's king. Abandoned by his companions, he was captured, condemned as a traitor, and executed in 1340.