1. (adjective) of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church

• gregorian chant
• plainchant
• plainsong
• gregory
• gregory i
• gregory the great
• saint gregory i
• st. gregory i

2. (adjective) of or relating to Pope Gregory XIII or the calendar he introduced in 1582

• gregorian calendar
• new style calendar
• gregory
• gregory xiii
• ugo buoncompagni

1. (adjective) of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church

• gregory
• gregory i
• gregory the great
• saint gregory i
• st. gregory i

2. (adjective) of or relating to Pope Gregory XIII or the calendar he introduced in 1582

• gregory
• gregory xiii
• ugo buoncompagni