On leaving the convent he entered into the magistracy, became president on the place of his uncle, embraced the cardinal's party, which did not prove want of sagacity, became chancellor, served his Eminence with zeal in his hatred against the queen-mother and his vengeance against Anne of Austria, stimulated the judges in the affair of Calais, encouraged the attempts of M. de Laffemas, chief gamekeeper of France; then, at length, invested with the entire confidence of the cardinal—a confidence which he had so well earned—he received the singular commission for the execution of which he presented himself in the queen's apartments.