Oslo (English pronunciation: /ˈɒzloʊ/, oz-loh, Norwegian pronunciation: [ˈuʂˈlu] ( listen) or, rarer [ˈusˈlu] or [ˈuʂlu]) is the capital of Norway and most populous city in Norway. Oslo constitutes a county and a municipality.
Founded around 1000 AD, and established a "kaupstad" or trading place in 1048 by King Harald III, the city was elevated to a bishopric in 1070 and a capital under Haakon V around 1300. Personal unions with Denmark from 1397 to 1523 and again from 1536 to 1814 and with Sweden from 1814 to 1905 reduced its influence. After being destroyed by a fire in 1624, the city was moved closer to Akershus Castle during the reign of King Christian IV and renamed Christiania in his honour. It was established as a municipality (formannskapsdistrikt) on 1 January 1838. Following a spelling reform, it was known as Kristiania from 1877 to 1925, when its original Norwegian name was restored.