When did the first public opera house open in Venice?

The first public opera house, the Teatro di San Cassiano, opened in Venice early in 1637.1

This inauguration marked a pivotal shift in the history of opera, as it transitioned the art form from the exclusive patronage of royalty and nobility to a commercial venture accessible to the broader urban population. By establishing a public venue, Venice fostered a competitive environment that prioritized sensational plots, elaborate stage machinery, and the rising influence of star singers, such as castrati. This commercialization ultimately reshaped musical structure, leading to a greater emphasis on solo arias over recitative and setting the stylistic trajectory for opera for the next two centuries.1