He was created a peer of France in 1458, and made governor of Paris during the war of the League of the Public Weal (1465).
This Antoine de Chabannes, count of Dammartin in right of his wife, fought under the standard of Joan of Arc, became a leader of the Ecorcheurs, took part in the war of the public weal against Louis XI., and then fought for him against the Burgundians.
In 1464 the bishop joined the league of the Public Weal, and fell into disfavour with the king, who seized the temporalities of his see.
This is the Song of Nalaka (the Buddhist Simeon), and the words put in the mouth of the angels who announce the birth to him are: "The Wisdom-child, that jewel so precious, that cannot be matched, has been born at Lumbini, in the Sakiya land, for weal and for joy in the world of men."
Without holding any official post in the commonwealth he had created, the prior of St Mark's was the real head of the state, the dictator of Florence, and guarded the public weal "Dictator with extraordinary political wisdom.