High Quality Content by WIKIPEDIA articles! Frederick I of Denmark and Norway (7 October 1471 10 April 1533) was the son of the first Oldenburg King Christian I of Denmark, Norway and Sweden (1426 1481) and of Dorothea of Brandenburg (1430 1495). The name is also spelled Friedrich in German, Frederik in Danish, and Fredrik in Swedish and Norwegian. The underage Frederick was elected co-Duke of Schleswig and Holstein in 1482, soon after the death of his father, the other co-duke being his elder brother by ten years Johann (or Hans), the King. At Frederick's majority in 1490 both duchies were divided between the brothers.