King of Denmark and Norway, son of Federico II. He was born in 1577 and died in 1648. He ascended the throne in 1588 and was the most famous King of the House of Oldenburg. Did the war Swedes and he was appointed head of the League formed by the Protestant princes, but he was defeated by the Count of Tillyin 1625. However, he made an Honorable peace in 1645 and withdrew to Denmark, dying three years later. He made several useful reforms such as the reorganization of the University of Copenhagen, the creation of an Observatory, as well as several schools, nursing homes and schools. He also founded colonies in the Greenland and several provisions that extended trade in Denmark.