Mästerby Church dates largely from the 13th century. The nave, choir and apse were built first, at the beginning of the century. In the middle of the same century, the tower was also built. The nave was made higher about a century later, and at this time both the nave and choir received vaulted ceilings. The church has remained relatively unaltered since the end of the Middle Ages. Only the sacristy is significantly later, added in 1790. New windows were also made in the 1860s.
The church is richly decorated with frescos internally. They range in period from the 13th to the 17th century. In the apse, some Romanesque paintings survive, notably a depicting of Mary, while some have been covered with other paintings in the 17th century. The vaults in the nave are decorated with frescos from the 14th century, and the walls of the nave furthermore decorated by the artist sometimes referred to as the Master of the Passion of Christ (15th century). Still other frescos, in the choir, probably date from the 16th century, while another set, again in the nave, is dated to 1633.
The baptismal font is from the 12th century, Romanesque in style and a work by the sculptor known by the assigned name Byzantios. The triumphal cross is locally made, dating from the 13th century. Other furnishings date from the time after the Reformation.
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.