Nuno Álvares Pereira

Nuno Álvares Pereira (1360–1431) was a Portuguese general, legitimized son of the prior of Crato. In the 1383 crisis he backed John, Master of Aviz, and after victory at Atoleiros in 1384 was made constable of Portugal, harassing the Castilian army besieging Lisbon until plague forced it to withdraw.

On 14 August 1385 he led an outnumbered army to decisive victory over Castile at Aljubarrota, securing the new Aviz dynasty, and won again at Valverde.

When hostilities ended he gave much of his wealth to veterans. After his wife died he entered a Carmelite convent as Frei Nuno de Santa Maria.