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> According to linguist De Mauro ... Source? Mine is here: https://it.wikipedia.org/wiki/Lingua_italiana#Dal_latino_volgare_ai_volgari_italiani https://it.wiki

• gattilorenz 6y ago
  Your source quotes De Mauro as well :) I guess it very much depends on whether you consider writers, academics, and in general literate people, or the majority of the populace. In the former case, it's true that Italian was used across the peninsula.