The Church of the Holy Saviour or Sveti Spas in the UNESCO World Heritage town of Nesebar, Bulgaria, is a 17th-century church building, 11.70 m long and 5.70 m wide, consisting of a single nave and apse.
Although small, it is notable for its early 17th century wall paintings representing scenes from the Life of Christ and the Holy Virgin, with a painting of the Virgin Platytera in the apse.
The tombstone of the Byzantine princess Mataissa Cantacuzina, formerly here, is now in the Nesebar Archaeological Museum. The church itself is de-consecrated and is also used as a museum.
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.