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English: Jan Vermeulen, (or Johannes, Jean) also known as Molanus (Lille 1533 - Louvain 1585 - both then in the Spanish Netherlands) was an influential Counter Reformation Flemish Catholic theologian of Louvain University, where he was Professor of Theology, and Rector from 1578. He was a priest and canon of St. Peter's church in Louvain. Among many other subjects he wrote on the proper content of religious images, taking a very severe line in his De Picturis et Imaginibus Sacris ("Treatise on Sacred Images") of 1570. He was lead editor of an edition of the works of Saint Augustine, and wrote a history of Louvain.