One of the greater architectural jewels we can contemplate in the region of Liébana, is in the village of Piasca. Around the monastery and church of Santa María, rotated great part of the valley´s history. This church was declared national monument in 1930.We know there was a first written document about the monastery of Santa María de Piasca, in 930, when Teoda and Aragonti gave it to the village; "ubi ipsa bassilica fundata est". In 941 a group of 36 nuns, under the direction of the abbess Aylo, and by the rule of San Fructuoso, made a monastic pact, settling down with other male monks in a double community, until in 1078, doña Urraca, who was the abbess then, passed over to the convent of San Pedro de Dueñas, loosing this duplicity and depending from that moment to the Monastery of San Benito de Sahagún, as a priory.