Ganthem church is a well-preserved Romanesque church, finished in the middle of the 13th century. The choir with its apse is the oldest part, dating from the late 12th century. The nave is slightly later, from the beginning of the 13th century while the tower is the most recent addition. Apart from an enlargement of the windows made in the 19th century, and the addition of a sacristy in the 1930s, the church has remained unchanged since the 13th century.
The interior of the church is decorated with frescos from the 15th century. On the northern wall, a set of paintings depict the Passion of Christ. This set is unusual inasmuch as it has never been painted over, and has retained much of its original vibrancy. On the southern wall, another set of frescos depicts other religious motifs.
The church still contains a number of medieval items. The baptismal font is from the latter half of the 14th century and has been ascribed to the artist Hegvald. The triumphal cross is from circa 1200 and unusually well-preserved. The altarpiece is furthermore a copy of the original, 14th-century altarpiece now belonging to the Swedish History 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.