April Fools' Day's Religious Roots

Let’s be clear: April Fools’ Day is not a religious holiday.

It does, however, trace its origins to a pope.

The day began, most believe, in 1582, when Pope Gregory XIII decreed the adoption of the “Gregorian calendar” — named after himself — which moved New Year’s Day from the end of March to Jan. 1.

The change was published widely, explains Ginger Smoak, an expert in medieval history at the University of Utah, but those who didn’t get the message and continued to celebrate on April 1 “were ridiculed and, because they were seen as foolish, called April Fools.”