The presently visible stone church at Sproge dates from the 13th century. The nave and choir are the oldest parts of the church, built during the first half of the century. The tower was added at the end of the same century. On the south facade of the church there is a plaque claiming the construction date of the church to be 1058, but this date appears to be pure fantasy. The church however had a wooden predecessor, a stave church built on the same site. Some 40 planks from this church are preserved in the Gotland Museum in Visby. The wooden church was probably built during the 11th century.
The church was thoroughly reconstructed in 1839-40, when new windows were inserted in the wall, the interior medieval vaulting replaced by a modern ceiling and a new southern entrance constructed. Of the medieval inventories, only the 14th-century triumphal cross remains. The altarpiece and baptismal font both date from the 17th century. In the choir floor there also remain three medieval tombstones, and in the ground floor of the tower sits a pre-Christian picture stone with runic inscriptions. The picture stone tells the story of two men named Gairvatr and Audvatr who made a dolmen for their mother, and displays a picture showing the dead woman riding a sleigh towards the realm of the dead. Opposite this, a more modern memorial plaque has been put up, commemorating a British pilot who died when crashing with his plane in the Baltic Sea close to the church during World War II.
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.