Opera, until then the favourite entertainment of aristocracy and educated classes, was going to change radically as a consequence of the French revolution. In the three decades of the rise and fall of Napoleon, opera social function changed completely and irrevocably.
Frederick II was one of the most fascinating figure in medieval history. His power was immense: King of Sicily and Jerusalem, Emperor of the Romans, King of Italy and Germany. His kingdom extended from the northern sea to Sicily and, on the east, to Israel and Lebanon.
Venice was an important and rich commercial centre, welcoming foreign merchants, businessmen dignitaries and aristocrats on the Grand Tour. The demand for entertainment was therefore high, particularly during the Carnevale, Some enterprising impresarios came up with the idea of setting up a public opera house, charging the public for the hire of boxes on a subscription system. The business turned out to be profitable. In a few years 16 theatres were built requiring a big number of new operas. By the end of 1600 the repertoire counted about 300 operas.