In the turmoil following John II's capture at the Battle of Poitiers, Oresme appears to have supported the dauphin and newly-appointed regent in the absence of the king, Charles (later King Charles V). Charles' and his father's right to rule was being challenged by several factions within the French kingdom: King Charles II of Navarre questioned the Valois' dynastic legitimacy and tried to mobilise the French nobility and the citizens of Paris and other "bonnes villes" in order to seize the French throne for himself. At the same time, the merchants of Paris, under their leader Etienne Marcel, tried to limit royal power, especially in financial matters, by having the Estates-General pass the Great Ordinance of 1357. Meanwhile, a peasants' rebellion in Northern France known as the Jacquerie challenged the nobility's right to rule. While the noblemen suppressed the peasants, Charles of Navarre discredited himself by joining ranks with the partly violent merchants of Paris who not long after murdered their leader Marcel. Thus the resistance against Valois rule collapsed mostly of its own accord.