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CatholicSaints.Info » Blog Archive » Pope Gregory XIII
Top 100 Global Creator - P93. Pope Gregory XIII: Creator of Gregorian calendar - WCSA.WORLD
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/cdn.vox-cdn.com/uploads/chorus_image/image/51177367/GettyImages-56215179.0.jpg "We've been using the Gregorian calendar for 434 years. It's still bizarre. - Vox")
We've been using the Gregorian calendar for 434 years. It's still bizarre. - Vox
Pope Gregory XIII - Wikipedia
Today in History, February 24, 1582: Pope Gregory XIII outlined Gregorian calendar
The Pope who established our modern calendar, and why we use it today - YouTube
File:Pope Gregory XIII (Ugo Buoncompagni, 1502–1585, pope 1572), Promulger of the Gregorian Calendar MET 13987.jpg - Wikimedia Commons
February 9, 1581 Pope Gregory XIII, Creator of the Gregorian Calendar: A Signed Letter from 1581 – Papal Artifacts
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