Luynes was born on 30 October 1868 at the Château de Dampierre in Dampierre-en-Yvelines in the Île-de-France region in north-central France.

[5] Through his sister Yolande, he was uncle to Jean Maurice Paul Jules de Noailles, Duke of Ayen (a member of the French Resistance who died at the Bergen-Belsen concentration camp),[1] and Elisabeth Pauline Sabine Marie de Noailles (a prominent tennis player who competed in the Olympic games in 1920).

After Romania joined the Allies, the French War Department sent him to Iași (then known as Jassy in English) to assist King Ferdinand I's Army upon its return from Bucharest.

For his work in Romania, he was awarded the Cross of the Legion of Honour by French President Raymond Poincaré.

[11] The Duke died in the 16th arrondissement of Paris in March 1924, reportedly he "never recovered from the shock of the death of his eldest son".