GREGORY XVI., born at Belluno; occupied the Papal chair at a time of great civil commotion, and had much to do to stem the revolutionary movements of the time; developed ultramontanist notions, and paved the way for the hierarchical policy of his successor Pio Nono.

GREGORY NAZIANZEN, ST., bishop of Constantinople, born in Cappadocia; studied in Athens, where he became the friend of St. Basil, and held discussions with Julian, afterwards emperor and apostate, who was also studying there; had been bishop of Nazianzus before he was raised by Theodosius to the bishopric of Constantinople, which he held only for a year, at the end of which he retired into solitude; he was the champion of orthodoxy, a defender of the doctrine of the Trinity, and famed for his invectives against Julian; he has left writings that have made his name famous, besides letters, sermons, and poems (328-389).  Festival, May 9.

GREGORY OF NYSSA, ST., one of the Fathers of the Greek Church, brother of St. Basil, and bishop of Nyssa, in Cappadocia; he was distinguished for his zeal against the Arians, and was banished from his diocese at the instance of the Emperor Valens, who belonged to that sect, but returned to it after his death; he was an eminent theologian and a valiant defender of orthodoxy, on, according to Harnack, something like Hegelian lines (332-400).  Festival, March 9.

GREGORY OF TOURS, ST., bishop of Tours, French theologian and historian, born at Clermont; was mixed up a good deal in the political strife of the time, and suffered not a little persecution; was the author of a “History of the Franks,” the earliest of French chronicles, entitling him to be regarded as the “Father of Frankish History”; his history contains a great number of valuable documents, though it is written in a barbarous style, and not unfrequently evinces a lack of moral sensibility (540-594).

GREGORY THAUMATURGUS, ST., a theologian of the Greek Church, and a convert and disciple of Origen; became bishop of Neo-Caesarea in Pontus; was present at the Council of Antioch; numerous conversions from paganism are ascribed to him, as well as numerous miracles; d. 270.  Festival November 12.

GREGORY, DAVID, nephew of succeeding, born at Aberdeen; became professor of Mathematics in Edinburgh at the age of 23, and in 1691 was appointed Savilian professor of Astronomy at Oxford; was one of the first to publicly teach the principles of Newton’s philosophy (1661-1708).

GREGORY, JAMES (1), inventor of the reflecting telescope, born in Aberdeen; after a three years’ residence in Padua received the appointment of professor of Mathematics in St. Andrews, which he held from 1669 to 1674, when he was elected to the corresponding chair in Edinburgh; author of various mathematical treatises which display a fine originality; he was struck blind whilst working at his telescope (1638-1675).

GREGORY, JAMES (2), son of succeeding, was his successor in the chair of Medicine at Edinburgh, and wrote “Philosophical and Literary Essays”; compounded “Gregory’s mixture” (1753-1821).