St. Luke's Church was built by Mauro Kacafrangi in 1195 of which is mentioned in the inscription on the western façade. This is a modest one-nave church whose main nave is longitudinally divided into three parts. St. Luka’s church has characteristics of the Romanesque and Byzantine architecture. This is the only building in the town which did not suffer any major damage during earthquakes. It was depicted with frescoes soon after its construction, of which remained only some fragments on the southern wall.
The church altar was the work of Dascal Dimitrije, the founder of the Rafailovic school of painting from the seventeenth century. Once this church was catholic, but later it was given to orthodox people to use. Thus the church has two altars – the catholic and orthodox. The church floor is made of tombstones of common tombs of Kotor citizens, as burials took place in the very church until 1930s.
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.