Michel de Marillac was a French jurist and counsellor at the court of Louis XIII of France, one of the leading dévots. His uncle was Charles de Marillac, Archbishop of Vienne and a member of the king's council, the Conseil du Roi. A member of the circle of Marie de' Medici, he was arrested after the Queen Mother's flight in 1631 and died in prison.
Michel de Marillac was Minister of Justice in 1626. He was appointed Superintendent of Finances on 27 August 1624, with Jean Bochart. His advice to Cardinal Richelieu advocated conservative policies abroad and limited involvement in northern Italy during the War of the Mantuan Succession, while France was occupied with suppressing Huguenots at home and countering Habsburg influence in the drawn-out Bourbon-Habsburg wars that were not resolved until 1659. His main concern was encouraging economic growth, as a balance to the threats posed by popular unrest in France and the resistance to new forms of taxation to support the war.