Unionsriket

When the Second Schleswig War broke out in 1864, the government of Sweden-Norway felt compelled to enter the war on Denmark's side despite the terrible shape of the military. While the war ended in defeat, it cemented the romantic idea of Scandinavianism, which would culminate in a union - the Union realm.

Union Realm
The United Kingdoms of Scandinavia, later the United Kingdoms of Scandinavia and Iceland, initially contained three constituent kingdoms - Sweden, Denmark, and Norway, with Iceland becoming its own state and the 4th constituent member in 1919. The combined territories of the union, including those regions outside of geographic scandinavia, is referred to as the "Union Realm" (Unionsriket/Unionsriget).

Sweden
The largest of the constituent countries (not counting the overseas danish territories), Sweden hosts the union capital in Skövde.

Denmark
Beefing up the unions total landmass, Denmark also contains Greenland, the Faroe Islands, and until 1919, Iceland.

Norway
For a long time, Norway continued to be in a personal union with Sweden, though with great autonomy. In 1919 they received their own monarch.

Iceland
Iceland would be accepted as a full member in 1919, in a personal union under the Danish crown. However, they are de facto self governing via the icelandic parliament.

Skövde
The capital city of the Union Realm.