- Greece--Peloponnesus (Peninsula)1
- Greece--Rethymnon1
- Greece--Thessalonikē16
- Greek language5
- Greek language--Alphabet1
- Greek language--Grammar2
- Greek language--Translating into Arabic1
- Greek letters1
- Greek literature3
- Greek literature--Translations into Latin1
- Greek style bindings1
- Gregorian chants71
- Gregorian chants--Instruction and study1
- Gregorian chants--Manuscripts16
- Gregory I, Pope, approximately 540-6042
- Gregory IX, Pope, approximately 1170-12412
- Gregory XIII, Pope, 1502-15851
- Gregory XV, Pope, 1554-16231
- Gregory, of Nazianzus, Saint2
- Grigor, Tatʻevatsʻi, Saint, 1346-14091