Saint Prosper (Aquitanus), a church father of the 5th century, born near Bordeaux about 403, died about 464. He was distinguished as a chronologist, poet, and theologian, and is chiefly known from the prominent part taken by him in opposing Cassian and the Semi-Pelagians of Marseilles. Among the many works written by him against these and in defence of St. Augustine is the Carmen de In-gratis, considered to be one of the best Latin poems written by a Christian author. It is asserted, but on doubtful authority, that he became in 440 secretary or notarius to Leo the Great, and that he wrote the letters on Euty-chianism attributed to that pope. He drew up about 444 a paschal cycle of 84 years, which has perished, and a continuation of the chronicle of St. Jerome, from A. D. 379 to 455, under the title of Chronicon Consulare. Photius ascribes the final overthrow of Pelagianism to his unwearied labors. His feast is celebrated on June 25. St. Prosper appears to have lived and died a layman, though some writers have made him bishop of Riez (Rhegium) in Provence. There are several complete editions of his works, the best being those of Maugeant, with a history of his life, translated from Til-lemont (fol., Paris, 1711), and Foggini (fol., Rome, 1752), reprinted in vol. li. of Migne's Patrologie latine.