John I, Margrave of Brandenburg
Member of the House of Ascania
John I, Margrave of Brandenburg was from 1220 until his death Margrave of Brandenburg, jointly with his brother Otto III "the Pious". Wikipedia
Born: 1213
Died: April 4, 1266 (age 53 years)
Great-grandparents: Albert the Bear, Ada of Scotland, Floris III, Count of Holland, and more
Parents: Albert II, Margrave of Brandenburg
Partner: Jutta of Saxony (1255–), Hedwig von Pommern (1250–), and Sophia of Denmark (1236–)
Grandchildren: Waldemar, Margrave of Brandenburg-Stendal, Eric VI of Denmark, Christopher II of Denmark, and more