“Back in the old days in France (up until 1564), the new year was celebrated on April first, based on the Julian calendar. That was before King Charles IX came along and decided that everybody should be following the Gregorian calendar, which starts the new year on the first day of January.

“Not everyone welcomed this change, or so the story goes, and some people continued to celebrate April 1 as the first day of the year. Allegedly, those people were mocked and referred to as April fools. Whatever the case, it became a tradition to do things such as pasting a fish on unsuspecting people’s backs on April 1, and calling them a Poisson d’Avril or an April Fish. The symbol of the fish may also have been connected with Jesus Christ.”

[These undated postcards were found in this fine collection. There is a small envelope attached to one of the fish, meaning unknown. The caption, along with more vintage French April Fish postcards, found here.]