Nicolas de Harlay, seigneur de Sancy Maximilien de Béthune, duc de Sully. Meanwhile he had been a second time converted to Catholicism, but his influence at court waned, and he retired from public life in 1605. He survived until 13 October 1629, leaving a "Discours sur l'occurrence des affaires". His son, Achille Harlay de Sancy (1581–1646), was bishop of Saint-Malo. The Sancy diamond's known history began circa 1570 in Constantinople when purchased by de Sancy. Something of a gem connoisseur, de Sancy used his knowledge to prosperous advantage. Henry III of France suffered from premature baldness and tried to conceal this fact by wearing a cap.
Achille Harlay de Sancy Charles I of England, Harlay de Sancy was attached to the queen's ecclesiastical household, but the king secured his dismissal. Harlay named the Bishop of Saint-Malo in 1631, for which he was consecrated in January 1632. He served in this post until his resignation on 20 November 1646. He died six days later. Achille Harlay de Sancy Achille de Harlay de Sancy, Cong. Orat. (1581, Paris26 November 1646), the son of Nicolas de Harlay, seigneur de Sancy, was a French diplomat and intellectual who was noted as a linguist and orientalist. He entered Church service, becoming the Bishop of Saint-Malo.