Francis II of France
From 1550 to 1571, he was the Abbot of Clairvaux. He participated in the Council of Trent, 1562-1563. From 1567 to 1571, he was also the Abbot of Cîteaux and the superior general of the Cistercian Order. During that time, he issues a set of ecclesiastical ordinances (usually referred to as the "Ordinationes") based on the principles of the Council of Trent. At various times, Henry II of France, Francis II of France, and Charles IX of France all sought his advice.