April Fool’s Day goes back to the 1500s. Most scholars believe it started when the calendar changed from Julian to Gregorian, due to the Council of Trent.
Some people were slow in receiving the news, so they celebrated New Year’s the last week of March until April 1. They were teased and became the victims of various hoaxes.
The popularity of April Fool’s Day soared in England in the 1700s. Pranksters would play practical jokes on each other.