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Pope_Gregory_XIII__who_gave_his_name_to_the_Gregorian_calendar..jpg
Papal calendar: 2023 holds important events for Pope Francis
Inter gravissimas - Wikipedia
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Commission for the calendar reformation, under Pope Gregory XIII (1502-1585) the Julian Calendar was..., Stock Photo, Picture And Rights Managed Image. Pic. AHV-AGC-F-002022-0000 | agefotostock
The Story of the Calendar | Gregorian Calendar Adopted October 4, 1582
Gregorian Calendar | Information School | University of Washington
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Bell Schedule
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6 Things You May Not Know About the Gregorian Calendar | HISTORY
