Antoine_Arnauld Not to be confused with his father Antoine Arnauld (lawyer) or his nephew Antoine Arnauld (1616-1698). Antoine Arnauld, (February 6, 1612 - August 6, 1694) le Grand as contemporaries called him, to distinguish him from his father French Roman Catholic theologian, philosopher, and mathematician. He was one of the leading intellectuals of the Jansenist group of Port-Royal and had a very thorough knowledge of patristics.