For many years, its capital was named for King Christian IV ["the fourth"].
During World War II, this country was run by Josef Terboven, though its official Minister President was Vidkun Quisling. It used to be the western part of the Kalmar Union. More recently, in 2011 it suffered from a mass (*) murder at a youth league camp carried out by Anders Breivik. For many years, its capital was named for King Christian IV ["the fourth"]. For 10 points, name this Scandinavian country whose capital is now called Oslo.
During World War II, this country was run by Josef Terboven, though its official Minister President was Vidkun Quisling.
Kingdom of Norway [accept Kongeriket Norge]