On the 21st of the following June he assisted in achieving the victory of Arnay-le-Duc, and was then employed to negotiate a marriage between the prince of Navarre and Elizabeth I of England. Being in Paris on the night of St. Bartholomew he took refuge in the house of the English ambassador, but was arrested there. With his friend Arnaud de Cavagnes he was delivered over to the parlement, and failed in courage when confronted with his judges, seeking to escape death by unworthy means. He was condemned, nevertheless, on 27 October 1572, to the last penalty and to the confiscation of his property, and on 29 October he and Cavagnes were executed.