Cardinal Richelieu founds the Académie française, an official body whose purpose is to preserve and purify the French language.
Louis Maigret publishes the Tretté de la Grammaire française – the first grammatical description of French.
Francis I of France makes French the official language of France.
Aosta Valley becomes the first government authority to adopt Modern French as its official language – three years earlier than France.
Although the French language was born out of what is known as Vulgar Latin in the 5th century AD, the first evidence of Old French is Le Serment de Strasbourg, an oath declaring an alliance between the Holy Roman Emperor Charles II and Louis the German.