#OTD in 1582 – Pope Gregory reforms the calendar introduced by Julius Caesar in 45BCE: 4 October is followed by 15 October. However, the reform will not be implemented in Ireland till 1752.

The papal bull of February 1582 decreed that 10 days should be dropped from October 1582 so that 15 October should follow immediately after 4 October, and from then on the reformed calendar should be used. Most protestant countries adopted the calendar between 1699-1701. Great Britain, Ireland and the American colonies, did not switch over […]

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