Robert of Artois, Mahaut's vassal barons revolt against her. Louis is compelled to intervene, and strips her of power when she refuses to submit to his arbitration. Mahaut poisons Louis with Béatrice's help, and he dies, leaving behind a pregnant Clemence and the court in turmoil. La Loi des mâles (1957) (English title: The Royal Succession; literally "The Law of Males") With Louis dead and Clemence pregnant, Louis' uncle Charles and brother Philippe plot against each other for the regency. Waiting in the wings is Marguerite's brother Eudes of Burgundy, who seeks to defend the rights of Louis and Marguerite's daughter Jeanne. Philippe outmaneuvers his rivals and assumes power. Having trapped the embattled cardinals together in Lyon, he forces a papal conclave that—with some subterfuge—elects Jacques Duèze as Pope Jean XXII. Marie de Cressay gives birth to Guccio's son in a convent, and within days Clemence gives birth to Louis' son Jean. With Clemence deathly ill, Hugues de Bouville and his clever wife Marguerite enlist Marie as wet nurse to the young king. The Countess Mahaut recognizes the infant Jean as the only obstacle between Philippe—who is married to her daughter Jeanne—and the French throne. Fearful of Mahaut, Hugues and Marguerite switch Jean with Marie's child Giannino when the baby king is presented to the barons by the countess. Poisoned by Mahaut, the infant dies almost immediately. Without direct proof of her guilt, and unsure of Philippe's involvement, the Bouvilles are compelled to keep their secret or possibly be implicated themselves. As Philippe secures his support and accedes the throne, the Bouvilles coerce a devastated Marie to raise Jean as her own and—as a means to keep the secret—never see Guccio again. La Louve de France (1959) (English title: The She-Wolf of France) Louis and Philippe's younger brother Charles IV is now the French king. His sister Isabella is still married to the English King Edward II, whose open favour of his lover Hugh Despenser and the extended Despenser family has marginalized Isabella and incited rebellion among Edward's vassal barons. When rebel Baron Roger Mortimer escapes imprisonment in the Tower of London and flees to France to plot against Edward, Isabella later follows on the pretext of negotiating a treaty with her brother, and joins Mortimer as his lover and co-conspirator. A guilt-ridden Bouville finally admits the truth about the French boy king to Pope Jean, whose link to Philippe