Barthélemy was born at Cassis, in Provence, and began his classical studies at the College of Oratory in Marseilles. He took up philosophy and theology at the Jesuits' college, and finally attended the seminary of the Lazarists. While studying for the priesthood, which he intended to join, he devoted much attention to oriental languages, and was introduced by a friend to the study of classical antiquities, and particularly to the field of numismatics.[3]