The XI and XII centuries were the most important for the monastery´s life; It will be during the XII century when they will receive important donations from monasteries incorporating to Piasca: San Salvador de Buyezo, San Martín de Tornes and Santa Cecilia de Ubriezo, as well as San Martín de Aniezo in 1209. The XIV century marks the beginning of the monastery´s decline, notably descending the donations. In the XVII and XVIII centuries only a dozen monks lived in it, and in 1835, with the Desamortization, it became a parish church.Today the entrance to the church is through a pointed arch giving way to a building that must have been part of the dependencies from the old monastery. Then, a marvellous sight of the church appears in front of us, on the western wall. The door´s arch is slightly pointed, remembering Gothic reminiscences. It presents five archivolts on shafts, with beautiful capitals and fine carvings. The archivolts have artistic carvings in vegetable and historical motives. Over the main door, on the bullrush wall, there´s a vaulted niche with three arcades supported by capitals, where we can contemplate an image of the Virgin with Child in the centre, from the XVI century, substituting the old Romanesque one; to the left, a figure of San Pedro, and to the right, San Pablo. These two sculptures are Romanesque and original, from the time when the church was constructed.