Gerhard VI was the Count of Holstein-Rendsburg from 1382, and Duke of Schleswig as of 1386.
Gerhard VI was born around 1367, the son of Count Henry II from the Rendsburg line of the House of Schauenburg and Ingeborg of Mecklenburg. Wikipedia
Born: 1367
Died: 1404 (age 37 years)
Great-grandparents: Henry I, Count of Holstein-Rendsburg, Eric Magnusson, Ingeborg of Norway, and more
Grandparents: Gerhard III, Count of Holstein-Rendsburg, Albert II, Duke of Mecklenburg, and Euphemia of Sweden
Great grandchildren: Frederick I of Denmark, John, King of Denmark, Margaret of Denmark, Queen of Scotland, and more