Um primeiro reconhecimento dessa diferença ocorreu no reino Franco, primeiro quando em 787 Carlos Magno escreveu uma carta a um dos seus bispos aconselhando aos padres que melhorassem o seu Latim, e mais tarde em 813, quando ficou claro que os fiéis já não compreendiam o que era dito em Latim durante a missa, provavelmente devido ao Latim mais conservador mantido pelo Clero, Carlos Magno lançou um édito em que ordenava que "todos os clérigos deveriam traduzir esses sermões para o vernáculo local ou para o idioma Franco, para que todos pudessem compreender melhor o que era dito".
easdem homilias quisque aperte transferre studeat in rusticam romanam linguam aut thiotiscam, quo facilius cuncti possint intellegere quae dicuntur).
Pois, nem sequer sabemos exactamente se sabia ler e escrever... mas, como Imperador, poderemos presumir q sim...
«Language and education
Sketch thought to be of Charlemagne c. 800
Einhard speaks of Charlemagne's patrius sermo ('native tongue').[37] Most scholars have identified this as a form of Old High German, probably a Rhenish Franconian dialect.[39][40] Due to the prevalence in Francia of the "rustic Roman", he was probably functionally bilingual in both Germanic and Romance dialects from a young age.[37] Charlemagne also spoke Latin, and according to Einhard could understand and perhaps speak some Greek.[41]
Charlemagne's father Pepin had been educated at the abbey of Saint-Denis, though the extent of Charlemagne's formal education is unknown.[42] He almost certainly was trained in military matters as a youth in Pepin's court,[43] which was itinerant.[44] Charlemagne also asserted his own education in the liberal arts when encouraging their study by his children and others, though it is unknown whether his study was as a child or at court during his later life.[43] The question of Charlemagne's literacy is subject to debate, and there is little direct evidence from contemporary sources. He normally had texts read aloud to him and dictated responses and decrees, though this was not unusual even for a literate ruler at the time.[45] The German historian Johannes Fried considers it likely that Charlemagne would have been able to read,[46] though the medievalist Paul Dutton writes that "the evidence for his ability to read is circumstantial and inferential at best,"[47] and concludes it likely that he never properly mastered the skill.[48] Einhard makes no direct mention of Charlemagne reading, but recorded that he only attempted to learn to write later in life.[49]»
https://en.wikipedia.org/wiki/Charlemagne