Operatic History in the Eighteenth Century

1922 saw the first night of Leo Fall's operetta named after the best known mistress of the French King Louis XV. This lady was born Jeanne Poisson. What is the title King Louis gave her, which is also the title of Fall's operetta?

The opera "Die Geigenbauer von Cremona" ("The Violin-Makers of Cremona") by Jenö Hubay (aka Eugen Huber) was first performed in 1894. It tells the story of the most important family of violin-makers. What is their family name, from which is derived the name of the most valuable type of violin?

In 1900, Lothar Kempter completed an opera named "Les Sans-Culottes" - the nickname of the French Revolutionary soldiers. Jacques Offenbach had already composed an opera in 1869 named after the Flemish peasants who fought the "sans-culottes" in the Peasants' War of 1798. What did the French call their opponents? It is also the title of Offenbach's opera.

Giuseppe Mosca completed in 1824 an opera named after the king who ruled Prussia from 1740 until 1786. What was the first name of this king belonging to the Hohenzollern dynasty?

In 1867, Emile Jonas composed an opera named "Marlborough s'en va-t-en guerre" ("Marlborough Heading for War"). Lord Marlborough has a family name that is quite well known. (Marlborough is the estate he was given by the British monarch). What is the full name of the first Duke of Marlborough?