The Church of Santa María de Sariegomuerto is a Romanesque-style church in the municipality of Villaviciosa. The church appears to date originally from the 12th to 13th centuries; it appears to be mentioned in documents in 921, linked to grants by Ordoño II to the Oviedo Cathedral. The church has undergone a number of refurbishments along the centuries. The church was rebuilt after arson during the Spanish civil war.
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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.