There is no saint by that name. However, there are very many saints by the name of Gregory.
Gregorian Chant
Joyce Ballou Gregorian died in 1991.
Arthur T. Gregorian died in 2003.
Pope St. Gregory the Great is the patron saint of singers and choirs because he is the one who compiled and advanced Gregorian Chant (named after him).
Pope Saint Gregory the Great had plainchant renamed "Gregorian Chant" after him.
The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.The Gregorian calendar.
Pope St. Gregory the Great collected the melodies and plain chant of the Church and they became so associated with him that they are now known as Gregorian Chants.
The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.The United States uses the Gregorian calendar.
Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.Monday is the second day of the week in a Gregorian calendar.
Saint Agnes was martyred in Rome.
I can find no saint named Coluba.
Saint Oda died in 726.