[lochland]

Your pointing to the Papal States reminds me: another period of Italy's history also demonstrates this narrative quite well. The Fascist government was the first body to publish a large amount of literature in Italian, which lead to more Italians speaking it than ever had. And as the people used Italian as a kind of pidgin under the Papal States, so too did they use it as a pidgin when so many were displaced during and following the War and the partisan resistance.