1646-1720. Roman Catholic scholar. Although trained for the Society of Jesus, he became a secular priest. He was particularly noted for his knowledge of oriental languages, becoming one of the principal advisers of Louis XIV's minister Colbert on matters relating to the East. His writings were mainly devoted to showing the relationship between the Orthodox and the Roman churches, as he sought to prove the “continuity of the faith” in opposition to Protestant contentions that the Roman Catholic Church had perverted the faith. His most important works were De la Perpetuité de la foi de l'église sur les sacrements et autres points (1713) and Historia patriarchum Alexandrinorum (1713).