Who married Charles I, Duke of Bourbon?

Charles de Bourbon (1401 – 4 December 1456) was the oldest son of John I, Duke of Bourbon and Marie, Duchess of Auvergne.

Agnes of Burgundy (1407 – 1 December 1476), duchess of Bourbon (Bourbonnais) and Auvergne, countess of Clermont, was the daughter of John the Fearless (1371–1419) and Margaret of Bavaria. Her maternal grandparents were Albert I, Duke of Bavaria and Margaret of Brieg. Her paternal grandparents were Philip the Bold and Margaret III, Countess of Flanders.