Pope Gregory XIII & the Ten Lost Days!

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Pope Gregory XIII by Pietro Paolo Olivièri, Santa Maria in Aracoeli

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Pope Gregory XIII (r. 1572-85) is, perhaps, best remembered for introducing the calendar that bears his name.

On February 24th 1582, Gregory XIII issued the bull, Inter gravissimas, which modified the Julian calendar, introduced by Julius Caesar in 46 BCE.

​The Gregorian calendar came into effect later in the same year when October 4th was followed by October 15th, leading many to accuse Gregory XIII of stealing ten days from their lives!

Pope Gregory XIII is interred in St Peter's Basilica. His funerary monument refers to his amendment of the Julian calendar.  

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