Cassian, John(kăsh`ən) (Johannes Cassianus), 360–435, an Eastern Christian monk and theologian who brought Eastern spirituality to the West. Cassian toured the ascetic monastic settlements of Egypt before he was driven from the East during the controversy over the theology of OrigenOrigen
, 185?–254?, Christian philosopher and scholar. His full name was Origines Adamantius, and he was born in Egypt, probably in Alexandria. When he was quite young, his father was martyred.
..... Click the link for more information. . He settled at Marseilles (415) and established religious houses for men and for women. He was attacked for Semi-Pelagianism (see PelagianismPelagianism
, Christian heretical sect that rose in the 5th cent. challenging St. Augustine's conceptions of grace and predestination. The doctrine was advanced by the celebrated monk and theologian Pelagius (c.355–c.425). He was probably born in Britain.
..... Click the link for more information. ), but he was trusted in Rome. His Conferences, a record of his earlier experiences with famous abbots and ascetics in Egypt, and his Institutes, a treatise on monasticism, had a critical influence on Western monasticism, especially in matters of ascetic and mystical life. He wrote against Nestorianism.
See study by O. Chadwick (2d ed. 1968).