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 (then including much of present-day Finland), and Norway, together with Norway's maritime colonies (then including Iceland, Greenland, the Faroe Islands, and the Northern Isles of Orkney and Shetland). The union was not quite continuous; there were several short interruptions.

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