Question: Who is Isabella Of Valois, Duchess Of Bourbon's father-in-law?

Knowledge 1: Isabella of Valois, Duchess of Bourbon
Isabella of Valois, Duchess of Bourbon or "Isabella of France" (1313 – 26 July 1383), was a Petit Fille of France, and a daughter of Charles of Valois by his third wife Mahaut of Châtillon.She was the wife of Peter I, Duke of Bourbon. [SEP] Knowledge 2: Peter I, Duke of Bourbon
Peter I of Bourbon (1311 – 19 September 1356, Poitiers) was the second Duke of Bourbon, from 1342 to his death.Peter was son of Louis I of Bourbon, whom he also succeeded as Grand Chamberlain of France, and Mary of Avesnes.Duke Peter is reported to have been somewhat mentally unstable, a trait of nervous breakdowns (presumably hereditary)that showed clearly for example in his daughter Joan of Bourbon, the queen, and in her son, king Charles VI of France, as well as in Peter's only surviving son, Duke Louis II.
Knowledge 1: Isabella of Valois, Duchess of Bourbon
Isabella of Valois, Duchess of Bourbon or "Isabella of France" (1313 – 26 July 1383), was a Petit Fille of France, and a daughter of Charles of Valois by his third wife Mahaut of Châtillon.She was the wife of Peter I, Duke of Bourbon. [SEP] Knowledge 2: Charles, Count of Valois
Charles of Valois( 12 March 1270 – 16 December 1325), the third son of Philip III of France and Isabella of Aragon, was a member of the House of Capet and founder of the House of Valois, whose rule over France would start in 1328.Charles ruled several principalities.He held in appanage the counties of Valois, Alençon and Perche.Through his marriage to Margaret of Anjou, he became Count of Anjou and Maine.Through his marriage to Catherine I, titular empress of the Latin Empire, he was titular Latin Emperor of Constantinople from 1301 – 1307, although he ruled from exile and only had authority over Crusader States in Greece.The grandson of Louis IX of France, Charles of Valois was a son, brother, brother- in- law and son-in- law of kings or queens( of France, Navarre, England and Naples).His descendants, the House of Valois, would become the royal house of France three years after his death, beginning with his son Philip VI of France.
Knowledge 1: Isabella of Valois, Duchess of Bourbon
Isabella of Valois, Duchess of Bourbon or "Isabella of France" (1313 – 26 July 1383), was a Petit Fille of France, and a daughter of Charles of Valois by his third wife Mahaut of Châtillon.She was the wife of Peter I, Duke of Bourbon. [SEP] Knowledge 2: Bernard de la Salle
Bernard de la Salle, was a French mercenary captain during the Hundred Years War.His story is mentioned in the Chronicles of FroissartAt the beginning of his career, in 1359, Bernard de la Salle, also known as Bernardon de la Salle, was in the service of Jean de Grailly Captal de Buch.On Monday, November 18, 1359, he climbed the castle of Clermont- en- Beauvaisis with steel grabs.However, after the Treaty of Brétigny( 1360) He and his men found themselves umemployed and so become one of the 30 or so, so- called Tard- Venus bandits.that ranged the French country side pillaging towns.In 1368, he is still in France with Bérard d' Albret, Gaillard de la Motte, Bernard d' Eauze and Bour de Badefol.In 1369, along with Bernard de Wisk and Hortingo de la Salle, he captured Belleperche Castle, where Isabella of Valois, Duchess of Bourbon) lived.The castle was, however, besieged by the troops of the Dukes of Bourbon and Burgundy.The Duke of Bourbon was her son, and Frossart tells us that the siege redoubt he organized was as strong and as well fortified as a good town might have been.The" Free companies" in the castle were expelled, but they took the duchess with them as hostage.Isabella was also mother- in- law of King Charles V of France, and remained a prisoner of Bernard de la Salle until 1372, when the king arranged for the ransom to be paid.

Answer: Louis I