Portrait of John I of Cleves- Marck (1419-1481), paternal Great-Grandfather of Anne of Cleves. His sister was Marie of Cleves, who was the mother of Louis XII, King of France, the elderly husband of Mary Tudor, sister of Henry VIII, from 1514-1515. John I married Elizabeth of Nevers, daughter of the Count of Nevers. They have six children, among whom were John II, Duke of Cleves; Philip of Cleves, Bishop of Amiens, Nevers & Autun; & Engelbert Count of Nevers. Portrait by Rogier Van der Weyden.