Oslo is a county and municipality, as well as the capital and largest city in Norway. It was established as a municipality on 1 January 1838.
According to the Norse sagas, Oslo was founded around 1049 by King Harald Hardråde. Recent archaeological research has uncovered Christian burials from before 1000, evidence of a preceding urban settlement.
More about Oslo on my travel blog ©JKScatena: “Oslo spending only a few crowns” (translated via Google Translate)