Francis I 1516–1561, Duke of Nevers (1521–1561)[1]
Charles II became entangled in intrigues at the court of King Francis I and was imprisoned in a tower of the Louvre in 1521. His mother and Charles III, Duke of Bourbon tried to get him released, but he died before they could secure his release.[2]
^Nicolas Viton de Saint-Allais: Charles de Clèves. in: L’Art de vérifier les dates des faits historiques, des chartes, des chroniques, et autres anciens monuments, depuis la naissance de Jésus-Christ, …. 1818, OCLC18113463, (online, Page 145.)
Sources
Boltanski, Ariane (2006). Les ducs de Nevers et l'État royal: genèse d'un compromis (ca 1550 – ca 1600) (in French). Librairie Droz.