Jansen, Cornelius, a Dutch theologian and bishop of Ypres, born in Louvain; studied the works of Augustine, and wrote a book entitled “Augustinus” in exposition of that great Father's doctrine of grace, which was published after his death, and which gave occasion to a great controversy between his followers, in France especially, and the Jesuits (1585‒1638).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Jannes and Jambres * Jansenists