The Duchy of Holstein was established by a Scandinavian monarch under what union?
Duchy of Holstein The Duchy of Holstein (German: "Herzogtum Holstein" , Danish: "Hertugdømmet Holsten" ) was the northernmost state of the Holy Roman Empire, located in the present German state of Schleswig-Holstein. It was established when King Christian I of Denmark had his County of Holstein-Rendsburg elevated to a duchy by Emperor Frederick III in 1474. Holstein was ruled jointly with the Duchy of Schleswig by members of the Danish House of Oldenburg for its entire existence.
Sophie Elisabeth Pentz Sophie Elisabeth of Schleswig-Holstein (20 September 1619 – April 29, 1657) was a daughter and the eldest child of king Christian IV of Denmark and Kirsten Munk. She shared the title "Countess of Schleswig-Holstein" with her mother and siblings.