The Duchy of Holstein was established by a Scandinavian monarch under what union?
Christian I of Denmark Christian I (February 1426 – 21 May 1481) was a Scandinavian monarch under the Kalmar Union. He was King of Denmark (1448–1481), Norway (1450–1481) and Sweden (1457–1464). From 1460 to 1481, he was also Duke of Schleswig (within Denmark) and Count (after 1474, Duke) of Holstein (within the Holy Roman Empire). He was the first Danish monarch of the House of Oldenburg.
Sweden in Union with Norway The Union between Sweden and Norway is an overriding theme of the history of Sweden in the 19th century. On 4 November 1814, the kingdoms of Sweden and Norway formed a personal union under one king. The two countries had completely separate institutions, except for the foreign service led by the king through the Swedish foreign minister.