French Calvinist controversialist. In 1674 he became professor of theology and Hebrew at the Protestant Academy at Sedan; when this was closed in 1681 he became minister in the Walloon church at Rotterdam. His Traité de la dévotion (1675; Eng. tr., 1692) had a huge circulation. His many works of controversy are energetic and not always orthodox. His Traité de la puissance de l'Église (1677) uses juridical arguments to vindicate the Calvinist view of authority in the Church. A tireless worker for all aspects of the Calvinist cause, he dominated the French refugee community in the Netherlands. His Lettres pastorales, published fortnightly from 1686 to 1689, record the suffering and constancy of the Protestants in France.