Oslo (is a municipality,as well as the capital and most populous city in Norway. As a municipality, it was established on January 1, 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King Christian IV. It was rebuilt closer to Akershus fortress, as Christiania (briefly also spelt Kristiania). In 1925, the city reclaimed its original Norwegian name, Oslo. The diocese of Oslo is one of the five original dioceses in Norway, which originated around the year 1070.