Under his reign the Langue d'Oil became for ever the French language, and the Langue d'Oc remained but a patois.
"Jasmin: Barber, Poet, Philanthropist" by Samuel Smiles
Among the more narrative forms are found the ballad, more especially favoured by the Trouveres, or minstrels of the "Langue d'oil" regions.
"Woman's Work in Music" by Arthur Elson
Trouveres use the Langue d'Oil in the south of France, ii.
"History of the Intellectual Development of Europe, Volume II (of 2)" by John William Draper
In 1267 Martino da Canale wrote in the same "langue d'oil" a chronicle of Venice.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 8" by Various