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 concurrently Duke of Schleswig and Count (from 1474: Duke) of Holstein. He was the first Danish monarch of the House of Oldenburg.