(*) Giovanni Paisiello wrote a less popular opera based on characters this spy introduced in Le Sacristain and The Guilty Mother.  
Studying under the financier Duverney, this man cornered the drinking water market in Revolutionary-era Paris.  He was the first man to publish the complete works of Voltaire.  This son of a watchmaker wrote Memoires defending his patent for a new escapement that allowed him to make a ring-sized watch for Madame de Pompadour.  This dude conducted loud closed-door conversations where he pretended to be a Spanish businessman named Roderigue Hortalez in order to funnel supplies to Silas Deane's countrymen.  He was dispatched to London to prevent the cross-dressing double agent Chevalier d'Eon from blabbing about a French invasion and helped Louis XVI funnel money to the Continental Congress.  (*) Giovanni Paisiello wrote a less popular opera based on characters this spy introduced in Le Sacristain and The Guilty Mother.  For 10 points, name this creator of Almaviva and the play, The Barber of Seville.
Studying under the financier Duverney, this man cornered the drinking water market in Revolutionary-era Paris.  
Pierre Beaumarchais [or Pierre-Augustin Caron de Beaumarchais] 