Guy Aldonce was the fourth son of Guy Aldonce de Durfort (1605-1665), marquis of Duras, count of Rozan and of Lorges, maréchal de camp, and Élisabeth de La Tour d'Auvergne, daughter of Henri de La Tour d'Auvergne and the sister of Turenne. His brother, Jacques Henri de Durfort de Duras, was also a Marshal of France. It is possible that the fame of their uncle played a major part in the military career of Jacques-Henri and Guy Aldonce.