Oddernes Church is the oldest building in Kristiansand from c. 1040. It was originally built of stone and the tower was later made of wood. The chancel has rubble walls and a semi-circular apse. In the 1630s the church was extended by 8 meters after a gift of funds from King Christian IV in connection with a visit in 1635. The money was used for major repairs in the years 1642-1644 and in 1699 for constructing the bell tower. There are three bells in the tower, the oldest from the 13th century.
The organ, altarpiece, pulpit and the tower were all the result of gifts from the first Mayor of Kristiansand, Christen Nielssøn Wendelboe and wife. The pulpit is a classical Baroque. The minstrels' gallery facing the church room along the north side of the church is built in a simple Renaissance style. It has 44 segments with images of prophets, apostles, and allegorical figures.
A new interior was installed in the church in 1788 and was elaborately decorated. The decorations and embellishments of the minstrel's gallery and the walls were covered with brown paint in 1827. In 1927 the paint was removed.
Findings in burial mounds in the area reveal to a settlement dating back to AD 400. It is also believed that there was a royal residence in Oddernes prior to 800. Some historians believe there was once a wooden church or stave church on the site where the present stone church is located.
A rune stone (now located in the porch) that originally stood in the churchyard shows the site has been central to the community even earlier in view of its possible reference to St. Olaf.
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.