The Church of Saint Demetrius of Thessaloniki in Veliko Tarnovo, Bulgaria, a medieval Bulgarian Orthodox church, was part of a monastery and played a role in the anti-Byzantine Uprising of Asen and Peter in 1185. Destroyed in the 13th century, it was reconstructed in the 1350s. Plundered in the 18th and 19th centuries, it was completely destroyed by an earthquake in 1913, leaving only the apse and fragments of frescoes. Reconstruction began in 1977–1985, led by Teofil Teofilov, based on architectural remains and examples from better-preserved Bulgarian churches. Two layers of frescoes, dating to the church's construction and the 14th century, have been preserved.
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.