this may sound crazy but
Fashionable?: Europe stands together. (Vivaldi, Vienna, Venetia)—This is unrelated, but Vivaldi makes me mostly think of Vivaldi's Spring (my grandfather had an alarm clock playing it)—opening my Vivaldi browser, I wikipedia/music catalogue researched a piece of Vivaldi music I did not know. Following the fall of Napoleon, the Concert of Europe; The Congress of Vienna (1814–1815) led to a European map layout with the Austrian Empire controlling Vivaldi's Venetia up until the First Italian War of Independence (1848–1849), where for a brief moment The Republic of San Marco, more Austrian dominance, war, and in 1866 Venetia included in the Kingdom of Italy (while the Austrian Empire became Austria-Hungary in 1867). Well, my point with that is some have claimed Vivaldi's Juditha Triumphans 'Salve invicta' chorus was an unofficial anthem for Venetia/Republic of San Marco (and still is?). I don't know about that, but pre Napoleon's Venetia 1796 was the Most Serene Republic of Venice, and it was here Vivaldi made the oratory for the ... I can't quite capture why there is ambiguity about the commissioning, but 1716 was the last war between the Ottoman Empire and La Serenissima. I've found two recordings to start out: Hyperion 1997/1998 and Tactus 2000/2002/2006. There was an ongoing decline in Venetian power (less money for musicians like Vivaldi), and a cultural shift in Venetia that led Vivaldi to become out of fashion, travel to Vienna, and in 1741 die—before US independence day 1776 (~35years) and Napoleons Venetia 1796 (~55years). And you know who lived, made music and died within those 55 years? Wolfgang Amadeus Mozart. That period is called the classical period in musicology.