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 Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.