Daily
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| Gregorian chant |
| Replacing the calendar |
| Confiscation Of Land |
| Diplomacy With Spain |
Your answer was: Replacing the calendar. |
Answer: Pope Gregory XIII is probably best known for the Gregorian calendar which corrected issues with the Julian calendar. See: • James C. Hamilton, 400th Anniversary of the Gregorian Calendar, 1982: A First Day Cover Survey Vatican Notes, Volume 67, Issue 380, 2019 Page 36-43 • Anonymous, Calendar Reform Vatican Notes, Volume 31 Issue 4 1983 Page 1 & 8 
 
400th Anniversary Of The Gregorian Calendar Scott # 715-717, 717a (1982) |
