Encyclopædia Britannica, Ninth Edition/Gregory
In the 9th edition of the Encyclopædia Britannica, Gregory may refer to:
- St Gregory the Great, a 6th-century pope and doctor of the Latin Church apocryphally credited with the creation of Gregorian chant,
- St Gregory II., an 8th-century pope,
- St Gregory III., an 8th-century pope,
- Gregory IV., a 9th-century pope,
- Gregory V., a 10th-century pope,
- Gregory VI., born Johannes Gratianus, an 11th-century pope,
- St Gregory VII., born Hildebrand, an 11th-century pope,
- Gregory VIII., born Albert de Mora, a 12th-century pope,
- Gregory IX., a 13th-century pope,
- Gregory X., a 13th-century pope,
- Gregory XI., born Pierre Roger de Beaufort, a 14th-century pope in Avignon,
- Gregory XII., born Angelo Corario, a 15th-century pope and bishop of Porto,
- Gregory XIII., born Ugo Buoncompagno, the 16th-century pope responsible for the Gregorian calendrical reforms,
- Gregory XIV., born Niccolo Sfondrato, a 16th-century pope,
- Gregory XV., born Alessandro Ludovisio, a 17th-century pope,
- Gregory XVI., born Bartolommeo Alberto Cappellari, a 19th-century pope,
- St Gregory the Illuminator, the 3rd- and 4th-century founder of the Armenian Church,
- St Gregory Theologus of Nazianzus, a 4th-century bishop, one of the four fathers of the Greek Church,
- St Gregory of Nyssa, a 4th-century bishop,
- St Gregory Thaumaturgus, a 3rd-century bishop,
- St Gregory of Tours, a 6th-century bishop and historian,
- John Gregory, a 17th-century Scottish churchman,
- David Gregory, a 17th-century Scottish physician,
- James Gregory, a 17th-century Scottish mathematician and physicist, inventor of the Gregorian telescope,
- David Gregory, a 17th-century Scottish mathematician and astronomer,
- John Gregory, an 18th-century Scottish physician,
- James Gregory, an 18th- and 19th-century Scottish physician,
- William Gregory, a 19th-century Scottish chemist,
- Duncan Farquharson Gregory, a 19th-century Scottish chemist and mathematician, or
- Olinthus Gregory, an 18th- and 19th-century English mathematician.