The Battle of Oslo was fought outside of Oslo on the night of 3 February 1161 between Haakon II of Norway and Inge I of Norway during the civil war era in Norway. As the son of Ingiríðr Ragnvaldsdótti
King Inge's army at the battle of Oslo in 1161, as imagined by artist Wilhelm Wetlesen in the 1899 edition of Heimskringla.
Oslo is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of 724,290 in 2025, while the city's greater urban area