With Bellini's "La sonnambula" successfully staged in March 1831 and Giuditta Pasta having demonstrated her extensive vocal and dramatic ranges in creating the role of Amina, the Swiss village maiden, she had been engaged by La Scala for her debut during the following season. Bellini and Romani then began to consider the subject of the coming autumn's opera. By the summer, they had decided to base it on Alexandre Soumet's play which was being performed in Paris at around that time and which Pasta would have seen.