Première attestation de « poisson d'avril » (Pierre Michault)

1466

The earliest known occurrence of the phrase 'poisson d'avril' in French, in Pierre Michault's Doctrinal du temps présent. Critically it does NOT mean an April 1st prank here: CNRTL glosses it as 'entremetteur, intermédiaire', a go-between carrying love letters. Its existence a century before the 1564 Edict of Roussillon is one of the main reasons historians reject the calendar-change origin story.