>>2467190Essentially in the past, France was divided in two halves, the southern part where "Oc" was used to say yes, and the northern part where "oil" was used. French was one of those oil languages, specifically it was francien, the language of Paris and it's surroundings (Back then France only referred to Paris and it's surroundings)
Oil languages had a lot of similarities between them, but they were divided into multiple groups of mutually intelligible languages, So essentially, a speaker of Angevin could understand a Gallo speaker, but neither could understand Francien wheras a Francien speaker could basically understand none of the other languages.
Langue d'oc however were actually closer to Catalan (it was in fact a langue d'oc) then to langues d'oil.
When France started to centralise those linguistic different were starting to become a problem for the Monarchy, so they started to legitimise a specific langue d'oil, Francien, above others, this policy was continued by the Revolutionnaries, and even by the Third Republic.