San Miguel de Lillo (monument) built
900 CE.
Shown on the map at 43.380°, -5.868°.
St. Michael of Lillo (Spanish: San Miguel de Lillo, Asturian: Samiguel de Lliño) is a Roman Catholic church built on the Naranco mount, near the Church of Santa María del Naranco in Asturias. It was completed in 842 and it was consecrated by Ramiro I of Asturias and his wife Paterna in the year 848. It was originally dedicated to St. Mary until this worship passed to the nearby palace in the 12th century, leaving this church dedicated to Saint Michael. It has been a part of the UNESCO World Heritage Site "Monuments of Oviedo and the Kingdom of the Asturias" since 1985. It originally had a basilica ground plan, three aisles with a barrel vaults and probably about five bays long, of which only the "Frankish-style royal 'westwork'" remains, since the building collapsed during the 12th or 13th century. Although narrow, the edifice is quite high due to the outside buttressing. Conserved are the fantastic jambs in the vestibule and the extraordinary plate tracery of the windows sculpted each from a single slab of stone by perforating it. Coupled with columns the biforas of the west facade are topped above a slender lintel beam by a roundel or a half-roundel with a quadrifora beneath.
Text from the Wikipedia article San Miguel de Lillo, licensed CC BY-SA 4.0.