Born in Laon from Protestant parents (Jean Rousset and Rachel Cottin), he studied at the Collège du Plessis in Paris.
After a conflict with his stepmother he joined the Dutch States Army during the War of the Spanish Succession and was present at the Battle of Malplaquet (1709).
[1] He worked together with Jean Dumont de Carelskroon (1667–1727), jurist of Charles VI, Holy Roman Emperor, and author of the Corps Universel Diplomatique du Droit des Gens,[2] to which he published an addition in 1739.
As he stated in the foreword to his 1733 Intérêts presens: Doing so, Rousset believed disputes between sovereigns could be settled by established procedures, following both older (Westphalia, Oliva, Golden Bul) and newer treaties (e.g. the 1713 Peace of Utrecht).
[7] Rousset and Dumont wrote a military account of the War of the Spanish Succession,[8] illustrated by the Dutch engraver and painter Jan van Huchtenburg.