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Related articles:
Gregorian calendar
Julian calendar
Pope
Pope Paul III
Pope Gregory I
Key terms: xiii pope calendar date papal church cardinal gregory xiii reform papacy spain duke colleges catholic rome accept trent carlo gregorius xiii founded followed protestant gregorian calendar patronage bologna clavius conclave pope gregory xiii gregorio xiii gregor xiii fitzmaurice julian calendar eastern orthodox paus gregorius xiii Search external links cited by footnotes on Wikipedia page Pope Gregory XIII: |
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