The Church of Santo Adriano de Tuñón is located on the bank of the River Trubia, next to an old Roman road. Founded on January 24, 891, by Alfonso III of Asturias and his wife Jimena of Navarra as a monastery church, it went through large transformations at the beginnings of the 12th century. It was declared a Spanish national monument in June 1931.
The church stands on a classic basilica ground plan, although in the 17th and 18th centuries it was extended with a nave structure at the western end, and a bell gable.
Mural paintings were rediscovered in the 20th century. The fresco paintings in this church are the only remains of Mozarabic painters' work in an Asturian art workshop.
References:The first written record of church in Danmark locality date back to the year 1291. Close to the church are several stones with a Christian text and cross inscribed. The oldest parts of the present red-brick church are from the 1300s. In the late 1400s the church was enlarged to the appearance it has today. The church has been modified both internally and externally several times, among other things after the fires in 1699 and 1889. There are lot of well-preserved mural paintings in the walls.