Norma is a tragedia lirica or opera in two acts by Vincenzo Bellini with libretto by Felice Romani after Norma, ossia L'infanticidio (Norma, or The Infanticide) by Alexandre Soumet. It is generally regarded as an example of the supreme height of the Bel canto tradition.
"Casta diva" was one of the most familiar arias of the nineteenth century.