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The kingdoms of Denmark, Sweden, and Norway formed the Kalmar Union, a personal union under Eric of Pomerania.
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Kalmar Union
Personal union in Scandinavia
The Kalmar Union was a personal union in Scandinavia, agreed at Kalmar in Sweden as designed by Queen Margaret of Denmark. From 1397 to 1523, it joined under a single monarch the three kingdoms of Denmark, Sweden, and Norway, together with Norway's overseas colonies.Source: Wikipedia (CC BY-SA)
Personal union
Situation of two states sharing a monarch without merging
A personal union is a combination of two or more monarchical states that have the same monarch while their boundaries, laws, and interests remain distinct. A real union, by contrast, involves the constituent states being to some extent interlinked, such as by sharing some…Source: Wikipedia (CC BY-SA)
Erik of Pomerania
King of Denmark, Norway and Sweden (1381/1382–1459)
Erik of Pomerania ruled over the Kalmar Union from 1396 until 1439. He was initially co-ruler with his great-aunt Margaret I until her death in 1412. Erik is known as Erik III as King of Norway (1389–1442), Erik VII as King of Denmark (1396–1439) and has been called Erik XIII as…Source: Wikipedia (CC BY-SA)