The Gregorian calendar, also called the Western calendar and the Christian
calendar, ..... authorization and by Lilio (Con licentia delli Superiori... et permissu
Ant(onii) ...... [show]. v ·...
The Gregorian calendar was first introduced in 1582, however, different countries
changed from the Julian Calendar at different times.
The Difference Between Julian and Gregorian Calendars. The Gregorian
Calendar was first introduced by Pope Gregory XIII - which is how the calendar
got its ...
The Gregorian calendar was proclaimed by Pope Gregory XIII and took effect in
most Catholic states in 1582, in which October 4, 1582 of the Julian calendar ...