Oleaster, Geronimo a Portuguese Roman Catholic theologian, was born at Lisbon. Some Portuguese writers call him Geronimo de Azambuja, because they regard him as a native of that place. About 1520 he joined the Dominicans, and acquired great reputation for his proficiency in philosophy, theology, Hebrew, Greek, and Latin. In 1545he went to Italy, and was one of the theologians appointed by Juan III of Portugal to take part in the Council of Trent. After his return he was appointed bishop of St. Thomas, in Africa, but declined, preferring to continue his literary labors. He, however, filled the office of inquisitor, and several others in his order, He died in 1663. Oleaster wrote Commentaria in Pentateuchum Moysi (Lisbon, 1556. fol. Antwerp, 1568, and Lyons, 1586,1589, fol.): — In Esaiam Commentaria (Paris, 1623, 1658, fol.). See Antoine de Sienne, Bibl. Donzin.; N. Antonio, Bibl. ispana Nova; Echard, Scriptores ord. Prcedicat.; Hook, Ecclesiastes Biog. 7:460.