After completing his course of humanities at
Mons, he studied philosophy at the
Catholic University of Leuven and theology at
University of Douai, in a seminary founded by the
bishop of Cambrai in connection with the faculty of theology. While studying theology he taught philosophy at the royal college. On 9 November 1610, he was made doctor of theology with the highest honours. The faculty of theology wished to retain this promising scholar, but there was no chair vacant. A professor,
Barthélemy Pierre de Lintra, resigned his position in favour of Sylvius, but, upon the death of
Estius (20 September 1613), of the
University of Douai, Sylvius succeeded him and later was called to direct the episcopal seminary in which he had been a student. He was appointed (1 February 1618) canon of the collegiate Church of St. Amat, and finally dean (28 January 1622), and to this title was added that of vice-chancellor of the university. When in 1648 the theologians of Leuven sought to win the University of Douai over to
Jansenism, Sylvius opposed them vigorously; but throughout the controversy he preserved the moderation of his character. Absorbed by study and his duties, his life was largely undisturbed for thirty years until his death. He was buried in the choir of the Church of St. Amat, and an epitaph engraved on his tomb recalled, with his titles and qualities, his attachment to
Augustine of Hippo and
Thomas Aquinas as a faithful disciple of one and a lucid interpreter of the other, also his liberality towards the poor and religious, whom he made his heirs. ==Works==