John I, Duke of Cleves, Count of Mark. Jean de Belliqueux, was Duke of Cleves and Count of Mark. Wikipedia
Born: February 16, 1419
Died: September 5, 1481 (age 62 years)
Great grandchildren: William, Duke of Jülich-Cleves-Berg, Anne of Cleves, François I, Duke of Nevers, and more
Children: John II, Duke of Cleves, Engelbert, Count of Nevers, Philip of Cleves, and more
Grandchildren: John III, Duke of Cleves, Charles II, Count of Nevers, Engelbert von der Mark-Kleve, and more
Spouse: Elizabeth of Nevers (m. 1455)