Hamar Cathedral was the see of the Ancient Diocese of Hamar. The ward at Hamar had included a significant part of the advanced provinces of Hedmark, Oppland, and Buskerud.
The house of God's development was started by Bishop Arnaldur 1124– 52, who was named first Bishop of Hamar in 1150 on his arrival from Gardar, Greenland.
The house of God was finished about the season of Bishop Paul 1232– 52. It was initially worked in the Romanesque compositional style and later changed over to Gothic.
Cleric Thorfinn of Hamar 1278– 82 was ousted and kicked the bucket at Ter Doest in Flanders. Thorfinn and numerous different religious administrators of the region couldn't help contradicting King Eric II of Norway with respect to ious issues, including episcopal decisions. Cleric Jörund 1285– 86 was exchanged to Trondheim.
In the outcome of the Reformation in Norway, the structure was renamed Hamarhus post and turned into the living arrangement of the sheriff. Albeit still utilized, the church building fell into decay, which finished with its besiegement by the Swedish armed force and endeavored devastation in 1567 amid the Northern Seven Years' War. Swedish powers had propelled assaults into Eastern Norway, catching Hamar and proceeded towards Oslo.
The Swedes later withdrew, burning Hamar on their way, decimating Hamar Cathedral and Hamarhus.