Sagene Church was built in gothic revival style and it was consecrated in 1891. It was designed by architect Christian Fürst in neo-Gothic style. There are 600 seats. The altarpiece was made by the painter Christen Brun (1828-1905) and depicts the removal of Jesus from the cross. The octagonal pulpit, made of pine, dates from 1890. The church organ is from 1891 and the only remaining of Hollenbach organs in Norway.
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.