The Origin of April Fools Day... maybe..

April Fools’ Day was coming, I was curious about its origin, I looked into it, and the curiosity led me to curate this blog, per usual for Curated Curiosity...

The Primary Stories 

   What started as a quick “why do we do this silly thing?” spiral turned into a surprisingly deep dive into one of history’s most delightfully murky traditions. Turns out, the real joke is on anyone who claims to know exactly where April Fools’ Day began. Historians, folklorists, and calendar nerds have been chasing this one for centuries, and the trail keeps looping back on itself, kind of like the ultimate prank. But that’s what makes it fun. Here’s the smartest, most evidence-based story I could piece together, without pretending I’ve cracked some ancient code.

    Let’s start with the ancient vibes, because April 1 sits right in that giddy zone where winter finally loosens its grip and spring starts playing tricks on us. One recurring thread points to the Roman festival of Hilaria (“joyful” in Latin), held around March 25 to honor the goddess Cybele and the resurrection of her lover Attis. Think costumes, disguises, role reversals, and general mockery of the powerful, basically the ancient Roman version of “gotcha.” It wasn’t exactly on April 1, but it was close enough to the spring equinox that some scholars see it as a spiritual ancestor: a time when the world itself feels like it’s fooling you with sudden warm days, surprise showers, and that one daffodil that blooms and then gets snowed on. 

   Fast-forward to medieval Europe, and the spirit of playful chaos shows up in things like the Feast of Fools (more common in December or January, but the same “invert the hierarchy, mock the solemn” energy). And yes, there’s that tempting 1392 reference in Geoffrey Chaucer’s The Canterbury Tales. In “The Nun’s Priest’s Tale,” a vain rooster named Chauntecleer gets tricked by a fox on what some early readers took as “the 32nd day of March”... i.e., April 1. Oh so funny to fool you with a day that doesn't even exist right?... 

     It’s a perfect little fable about flattery and comeuppance. Problem is, modern scholars think it’s a scribal error in the manuscripts. The line probably originally said something closer to “after March was gone,” pointing to May 2 instead. (Wait, a typo? We might not have it here) So Chaucer probably wasn’t inventing April Fools’ Day; we just wanted him to be the godfather of it. By we I mean fans of classical writing in the prose of the self sufficient poet who never wrote poetry, but I digress. 

   The theory that refuses to die, the one you’ll hear at every cocktail party, is the French calendar switch. In the mid-1500s, France (and much of Europe) was still using the old Julian calendar, where the new year often drifted around late March or early April, tied to the spring equinox and Easter. Then, in 1564, King Charles IX issued the Edict of Roussillon, officially moving New Year’s Day to January 1 to match the new Gregorian calendar reforms. News traveled slowly in the 16th century. People who kept celebrating the old way, exchanging gifts and throwing parties in the last week of March into April 1 got mocked as poissons d’avril (“April fish”), gullible little fish easily hooked. French kids still sneak paper fish onto their friends’ backs on April 1. It’s adorable and viciously clever at the same time. Obviously this is the true origin of it, found it! 

  

The Plot Twist.. of course I have a plot twist 

   Here’s the plot twist that keeps the origin story honest: clear written references to April 1 foolery pop up before the 1564 edict. A 1508 French poem by Eloy d’Amerval already drops the phrase poisson d’avril. A 1561 Flemish poem by Eduard De Dene describes a servant being sent on pointless “fool’s errands” specifically because it’s April 1. So the calendar change story is probably more of an accelerant than the spark. Something that gave an existing custom a convenient backstory and a national flavor.

The Rest of the Story 

    By the late 1600s the tradition had crossed the Channel and was thriving in Britain. The earliest documented large-scale English prank dates to 1698, when Londoners were invited to the Tower of London to watch the “annual washing of the lions” a total fabrication that drew crowds to an empty spectacle. Classic... I think. Scotland even split the fun into two days: April 1 for general pranks and April 2 (“hunting the gowk”) for sending people on wild-goose chases with fake messages.

    Okay, fourth-wall break time: Look, I went down every rabbit hole I could find; Library of Congress blogs, Britannica deep dives, primary-source footnotes... and the honest truth is that nobody knows for absolute certain. The custom was already bubbling in Renaissance Europe, probably drawing on older spring festival mischief, and the calendar story just gave it a tidy origin myth that stuck. It’s the perfect meta-joke: a holiday about being fooled whose own history keeps fooling us. Definitely, the origin is vague, or it's very specific but inaccurate. It calls into work while it is in the parking lot and can see you answering the phone. 

A Conclusion... Kind of.. 

   Today April Fools’ Day has gone global, mutating into everything from newspaper hoaxes (remember the BBC’s 1957 “Swiss spaghetti harvest”? Me neither but it pops up all over the Internet so shout out) to elaborate corporate gags and those chaotic group chats at 12:01 a.m. But at its core it’s still the same impulse that probably existed the first time someone in ancient Rome pinned a fake tail on a senator or a medieval peasant sent the lord on a fool’s errand: a little release valve for a world that takes itself too seriously.

    So the next time you get April fooled, or pull off the perfect prank, raise a glass to the anonymous medieval trickster who started it, whoever they were. We may never know their name, but we’ve been carrying on their legacy every April 1 for at least 500 years. And honestly? That feels like the best punchline of all, the fact that I would want to find the origin of something so silly, but it's not clearly recorded or definitve. I mean, why would it be, jokes on me. Happy  April Fools’ Day, friends. 

Don’t believe everything you read… including this blog. (Kidding. Mostly.)