Gladsax Church was constructed in the Romanesque style during the 12th century. It was vaulted, and a church tower was added in the 15th century. In 1857, the existing choir was demolished, and instead, three transepts with a new three-sided choir were built. In 1883, the tower was renovated according to designs by Carl Möller.
The nave contains frescoes created by Nils Håkansson in the mid-15th century. However, the paintings in the center of the cross date from 1898 and were copied from the part of the nave closest to the tower. The State Historical Museum notes that the paintings are 'heavily restored, partly repainted; the paintings in the western vault were concealed by the organ and were, therefore, 'copied' in the choir vault - the detailed image of the Fall of Man and Eve receiving her spindle shows fragments from the original painting.'
The ruins of the medieval Gladsaxe Castle are located in a meadow just east of the church.
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.