Michael Baius, also known as Michel De Bay, was a Belgian theologian. He formulated the school of thought now known as Baianism.
Painting of Baius
Jansenism was a 17th- and 18th-century Christian theological movement within the Catholic Church, rooted in the writings of Dutch bishop Cornelius Jansen, particularly in his book Augustinus published
La Conversion de saint Augustin ('The Conversion of St. Augustine', c. 1650) by French Baroque painter and Jansenist Philippe de Champaigne
Augustine, (AD 354–430) bishop of Hippo, Church Father, who is claimed as the progenitor of the Jansenist doctrine of grace
Abbé de Saint-Cyran – Jean du Vergier de Hauranne (1581–1643), abbot of Saint Cyran Abbey in Brenne, one of the intellectual fathers of Jansenism