 The monastery was founded in 1389 by the Constable D. Nuno Álvares Pereira (supreme military commander of the King), from the small Carmelite convent situated on lands acquired from his sister Beatriz Pereira and the admiral Pessanha.The reconstruction of the convent began sometime in 1393.In 1407 the presbytery and apse of the conventual church was completed, allowing the first liturgical acts in that year.