Coster, Jean (called Columba, from his gentleness), a Belgian commentator, was born at Louvain in 1515. He was prior of the canons-regular of St. Martin in that city, and died there, March 9, 1559, leaving editions and annotations of various Church fathers, for which see Hoefer, Nouv. Biog. Generale, s.v.; Jocher, Allgemeines Gelehrten-Lexikon, s.v.