 The opposition to the regency was led by Henri de Bourbon, Duke of Enghien, who pressured Marie into convoking the Estates General in 1614 and 1615.In 1616 Marie's rule was strengthened by the addition to her councils of Armand Jean du Plessis (later Cardinal Richelieu), who had come to prominence at the meetings of the Estates General.However, her son Louis XIII, already several years into his legal majority, asserted his authority the next year.