While still a young man he was a member of the grand council of
Philip the Good, the reigning
duke of Burgundy, and a
maître des requêts in the ducal court. Asked by the duke to assist, representing the clergy, in reducing to writing the customary law of Burgundy, he was sent instead as ambassador on several occasions, notably to
Pope Callixtus III (in 1456 with
Geoffroy de Thoisy, seigneur de Mimeure) and with the
duke of Cleves, to the
Council of Mantua (1459), convoked by
Pope Pius II, who was engaged in planning war against the Turks. Clugny obtained from Pius confirmation of the
Treaty of Arras (1435) and of the acts of
Pope Eugenius IV and his successors. Duke Philip agreed to promote him to the
see of Autun or
see of Mâcon, whichever became vacant first. Lieutenant of the chancellor of Bourgogne at the see of Autun, 2 December 1459. He was named
Apostolic Protonotary. He was one of the three Burgundian ambassadors sent to
Louis XI of France in
Melun in January 1465. After Philip's death, he was entrusted by the new duke of Burgundy,
Charles the Bold, to negotiate the
Treaty of Péronne (1468), to treat with Louis again at Noyon, and in 1473 to negotiate the
Treaty of Senlis. He headed the Duke's grand council from 29 May 1473, and was named Chancellor of the
Order of the Golden Fleece the following 15 September. With the death of Charles the Bold, 5 January 1477, Maximilian received the vast Burgundian inheritance by right of his wife. In the transfer of power to the Habsburg, Ferry de Clugny was confirmed in his positions, including that of Chancellor of the Golden Fleece (10 December 1477), where he guided the new sovereign of the order, and as councillor. ==Abbacies
in commendam==