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. The majority of the nobility, however, refused to attend. There were demonstrations in Champagne, Artois, and Burgundy, and Philip called a rapid assembly of the nobility on 2 February in Paris. Philip laid down the principle that Joan, as a woman, could not inherit the throne of France, played heavily upon the fact that he was now the anointed king, and consolidated what some authors have described as his effective "usurpation" of power. The exclusion of women, and later of their male descendants, was later popularized as the Salic law by the Valois monarchy. Joan, however, did accede in 1328 to the throne of Navarre, which did not hold to the Salic law.