Called le beau Ségur ("the handsome Ségur"), he was Master of the Regent, Philippe d'Orléans' Wardrobe (maître de la garderobe du Régent), and lived in an hôtel in Passy, Paris on a beautiful ten-acre property, which later passed to the Duchess of Valentinois and was named Hôtel de Valentinois after her.
[1] (The property is famous for being the residence of Benjamin Franklin for nearly ten years.)
On 10 or 12 September 1718, Ségur married in Paris Angélique de Froissy (1702–1785), the Regent's illegitimate daughter, at Gagny.
Described as "fresh, white, well-made, strong and intoxicating",[2] Angélique belonged to the inner circle of Louis XV's intimates.
He fought in the War of Austrian Succession, where he lost the Battle of Pfaffenhofen but prevented the total destruction of his army.