In Pas-de-Calais, which had been densely populated a long time, a language barrier had emerged in the 6th–7th century, but in the 9th century a romanisation-movement started that has continued until the present day.
Pas-de-Calais's, mis oli kaua aega tihedalt asustatud, tekkis keelebarjäär 6.-7. sajandil, kuid 9. sajandil algas romaniseerimisliikumine, mis on jätkunud tänapäevani.