Seest Church consists of a Romanesque choir and the ship, originally the apse, and a late medieval tower in the west. A late medieval porch in front southern door was demolished by the mid-1800s. The walls of chancel and nave is of field stone, and space has retained his flat beam ceilings. Arc is a brick wall on the Renaissance, possibly from 1539. During restoration 1963-64, led by architect JK Jepsen, Kolding, was after replacing the church's heating system by yellow square tiles in the floor and wooden floor under the new pews.
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.