Nuno Álvares Pereira was a 14th-century Portuguese nobleman and military leader who secured his nation's independence from Castile. Serving as the constable of Portugal, he commanded armies during the 1383–1385 Crisis, most notably leading a smaller force to victory at the Battle of Aljubarrota. After his distinguished military career and the loss of his worldly wealth, he entered the Carmelite Order. He lived his final years as a monk at the Carmo Convent, where he was known for his devotion and asceticism.