Which opera was performed first, Andrea Chénier or Prince Igor?
Andrea Chénier:  It was first performed on 28 March 1896 at La Scala, Milan. Prince Igor: Prince Igor (Russian: Князь Игорь , "Knyaz' Igor'") is an opera in four acts with a prologue, written and composed by Alexander Borodin. Prince Igor:  It was first performed in St. Petersburg, Russia, in 1890.
Prince Igor