[cowl]

Maybe you are confusing what lingua franca means. Yes the literature used Latin but at that period only a tiny fraction of people could read or write. There where many more languages that we even have today spoken by the general populace.

French maybe came close to being a Lingua Franca in the 18-19th century when almost all aristocracy could speak, read and write it but then again the people did not. The Real Lingua Franca was a mix of Italian, French, Spanish and Greek that was used by the merchants of the Mediterranean. Only English has the People Mass to be considered a Lingua Franca for all intents and purposes.

[oblio]

Spanish, too.