Gustav I, born Gustav Eriksson, later known as Gustav Vasa (12 May 1496 - 29 September 1560), was King of Sweden from 1523 until his death. The first monarch of the House of Vasa, his family remained the royal house of Sweden for much of the 16th and 17th centuries. Gustav I was elected regent in 1521 after leading a rebellion against Christian II of Denmark, the leader of the Kalmar Union who controlled most of Sweden at the time. The Kalmar Union was the union of the three kingdoms of Denmark, Norway (including Iceland, Greenland, Faroe Islands, Shetland and Orkney) and Sweden (including some of Finland) under one king, nevertheless irregularly, from 1397 to 1523.

Source: University of Texas at Austin, Perry-Castaneda Library, Map Collection
http://www.lib.utexas.edu/maps/
From "The Cambridge Modern History Atlas" edited by Sir Adolphus William Ward, G.W. Prothero, Sir Stanley Mordaunt Leathes, and E.A. Benians. Cambridge University Press; London. 1912