Norma is the eight opera in Bellini's catalgue, and third last in chronological order, followed only by Beatrice di Tenda of 1833, and I Puritani of 1835. The text for the opera was the work of the best-known librettist, Felice Romani, and was based on a contemporary French drama, Norma au L'infanticide by Soumet.
Norma occupies a very particular place in operatic repertoire, a dramatic work of lyrical beauty, not least in the most fanous of Norma's arias, Casta diva (Chaste goddess), her first-act prayer to the moon. Oroveso calls the Druids to watch for the new moon in Ite sul colle, o Druidi (Go to the hills, O Druids) and in the second act he warns of Pollione's possible successor, inveighing against Roman tyranny in Ah! del Tebro al giogo indegno (Ah! To the disgraceful yoke of Rome). Norma has notable duets with Adalgisa and with Pollione, revealing different aspects of her tragic character.