Charles befriended and was thought to be trying to influence the Dauphin, and was apparently involved in a botched coup d'état in December 1355 whose purpose appears to have been to replace John II with the Dauphin.
Karlo se sprijateljio te se mislilo da pokušava utjecati na Dauphina, te je očito bio uključen u neuspjeli državni udar u prosincu 1355. čiji je cilj, čini se, bila zamjena Ivana II. s Dauphinom.