Monumental complex that emerged in the 10th century with the construction of the pre-Romanesque church of San Salvador, ordered to be built by King Alfonso III, the last of the Asturian monarchy. This temple is one of the jewels of Asturian art, with a rectangular floor plan and three naves, with a closed portico on the south flank. Next to this temple a Cistercian monastery, dedicated to Santa María, began to be built in the 13th century. From the initial stage of this monastery the church of Santa María is preserved, while the rest of the elements (cloisters, chapter house, sacristy and abbey house and stables) were progressively built between the 16th and 19th centuries. In the 20th century the Provincial Seminary of Asturias was installed here, abandoning the complex in the 1950s, beginning the recovery of heritage in 1986 with the start of work on the Valdediós Workshop School. In the last years of the 20th century, a monastic community was re-counted.