Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality (formannskapsdistrikt), 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.
Oslo is considered a global city and ranked "Beta World City" in studies performed by the Globalization and World Cities Study Group and Network in 2008. For several years, Oslo has been listed as one of the most expensive cities in the world along with such other global cities, as Zurich, Geneva, Copenhagen, Paris, and Tokyo. In 2009, however, Oslo regained its status as the world's most expensive city.
As of 2010, the metropolitan area of Oslo has a population of 1,442,318 of whom 912,046 live in the contiguous conurbation. The population currently increases at a record rate of 1.64% annually, making it the fastest growing city in Europe. This growth stems from immigration, as the Norwegian population in the city is decreasing. The immigrant share of the population in the city proper now counts more than 25% of the city's total. Getting to know Oslo, Norway as One of the Most Expensive City 2011
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