Flesberg stave church was probably built around 1200. The first written reference to the church is from 1359. The church was originally a single nave church with four free-standing internal posts bearing a raised central roof, surrounded by an ambulatory or aisles on all four sides. It had a narrower chancel, also with a raised central roof, and a semicircular apse. It was surrounded by a gallery loosely connected to the plank walls.
In 1735, the chancel and apse as well as the east wall of the nave were removed. The nave was extended eastwards and two transepts were added, making a cruciform plan. The additions were built in horizontal log construction with notched corners. Of the original stave church only three outer walls survived, as the internal posts and the raised roof were eliminated.
The church yard is fenced with big slates brought from Haukeli farm (on the Lågen west bank) during winter seasons. Some slates have iron rings affixed, these rings were used for tying horses during service - each farmer had a designated ring for his horse (the oldest dated ring from 1661). The idiosyncratic stone fence is shown on a 1701 painting (the oldest existing painting of a stave 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.