SO turns out Paisiello's 1782 Barber of Seville wasn't even the first Barber opera, it was just the first to become a massive international sensation.

Before Paisiello's Barber, there was BENDA'S BARBER
yes in 1779, four years after the premiere of Beaumarchais' play The Barber of Seville, Friedrich Ludwig Benda premiered Der Barbier von Sevilla, and 247 years later I have gotten my hot little hands on the vocal score

cover page of the piano reduction score of Friedrich Ludwig Benda's "Der Barbier von Sevilla"
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