 With only his niece between himself and the throne, Philip engaged in some rapid political negotiations and convinced Charles of Valois, who along with Odo IV was championing Joan's rights, to switch sides and support him instead.In exchange for marrying Philip's daughter, Odo IV abandoned his niece's cause, not only her claim to the French throne but also her claim to Navarre's.On 9 January 1317, with Charles's support, Philip was hastily crowned at Rheims.