Gamlebyen Church is a private church, belonging to Oslo University Hospital and is also called Oslo Hospital's Church. It is leased to the Diocese of Oslo of the Church of Norway and serves as the parish church for the Gamlebyen parish in Oslo. Up to 1925 it had the name Oslo Church, but when the city changed its name from Kristiania to Oslo, the church got the present name. The present church building is listed in 1796 partly on the foundations of the Franciscan monastery church built around 1290. The church is located at the foot of the north-facing slope Ekeberg, across the street from the Gamlebyen Cemetery. The chapel at the cemetery is abandoned as a burial chapel and leased to the Ethiopian community in Oslo. At funerals, the church itself is now used instead.
Abbey Church which was built towards the end of the 1200s, was one of Oslo's earliest buildings constructed of brick which came from Duke Hakon's brickworks on the riverbanks of Alnaelva. After the Protestant Reformation in 1536 the church was converted into a hospital. In 1567, during the Swedish attack, the first church was destroyed. On the ruins of the abbey, the building was divided into several floors and served thereafter as a hospital building with a church on the first floor. The house now known as the 'stone building' was added later. This is regarded today as the oldest hospital building. During the 1700s there were also several buildings, including 'Dollhuset' for psychiatric patients.
In 1734, a new church was built on the foundations of the nave. After the last fire on 13 January 1794 the church was rebuilt in Louis XVI style two years later, again in brick. The old medieval choir was demolished and replaced with a tower that stands there today. The newly built church was opened on 11 May 1796. In the 1800s the church was rebuilt several times. In the period 1934-1939, it was renovated by architect William K. Essendrop, reestablishing its earlier appearance. The flat murtaket was replaced with an arched vault, and a new sacristy was built. The church was reopened on Christmas Eve 1939, in the presence of King Haakon VII.
The church has seating for just 200 people. It is one of the oldest churches in Oslo that is still in use. The main building is from 1796. The Stone Building is from 1737. In 1880, seating was added and changes were made to the altar and pulpit. From 1934 to 1939, extensive restoration reestablished the look of 1796. The pulpit from 1880 hangs above the altar but is not in use.
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.