Akershus

Akershus is a traditional region and current electoral district in Norway, with Oslo as its main city and traditional capital. It is named for Akershus Fortress in Oslo. From the middle ages to 1919 Akershus was a fief and main county that included most of Eastern Norway; from the 17th century to 2020 Akershus also had a more narrow meaning as a county that included most of the Greater Oslo Region.

Originally Akershus was one of four main fiefs in Norway and included almost all of Eastern Norway. The original Akershus became a main county in 1662 and was sometimes also known as Christiania Stift. It included several sub counties; in 1682 its most central areas, consisting of modern Oslo and Akershus, became the sub county of Akershus within the larger main county of the same name.