The monastery dates back to the 10th century and it seems to have been a monastery for monks and nuns from the earliest times until the 12th century. In 1175 after a period of decadence, Countess Fronilda de Lemos restored monastic life, the monastery was rehabilitated and integrated into the Cistercian order.

The church of the monastery is due to its profuse and diverse ornamentation, especially in its apse. It is considered to have been built prior to the incorporation of the monastery into the Cistercian order.

Birds devouring bulls