Formation of the Kalmar Union

Date: June 17, 1397 • Location: København, Denmark

The Kalmar Union is formed under the rule of Margaret I of Denmark.

The Kalmar Union was a personal union in Scandinavia, agreed at Kalmar in Sweden as designed by Queen Margaret I of Denmark. From 1397 to 1523, it joined under a single monarch the three kingdoms of Denmark, Sweden, and Norway, together with Norway's maritime colonies.