Most famous for an opera that includes toreadors?

Answer 1

I believe the Opera you seek would be the french opera CARMEN, with the music by Bizet? The libretto was written by Henri Meilhac and Ludoyic Halevy. The Toreador, named Escamillo, plays a rather key part in this opera. Carmen falls in love with him, thuus abandoning her original love, a corporal named Don Jose, which leads to her downfall. This opera is where the song with the lines "Toreador, en garde!Toreador, Toreador!"comes form. It is the only opera i can think of that includes a major charector as a Toreador, and i have found that a lot of people who have very little interest in the world of opera are familiar with some of the music, so it is indeed very famous.

i hope this is the kind of answer you were looking for.