Lärbro Church was probably built between 1260-1280. The unusual octagonal steeple was erected in the 1300s. The interior date made mainly from the times after Reformation. The murals in the church vaults are originals. In the chancel floor, by the chancel portal, there is a tombstone in memory of Nicolaus (Nils) Taksten from 1274.
To the west of church is a defence tower, which dates from the 12th century. It was built several storeys high with a lavatory on the third floor. Today, the defence tower is used as a belfry.
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.