Coster, Johannes a Flemish theologian, was born at Alost, became master of arts in 1561, and afterwards curate of Oudenarde, where he died, June 10, 1580, leaving a history of the Catholics in heretical cities, under the title, De Exitu Egypti et Fuga Babylonis (Douay, 1580). See Hoefer, Nouv. Biog. Generale, s.v.; Jocher, Allgemeines Gelehrten-Lexikon, s.v.