The tentative contract deadline was extended until 20 January, but by that date Romani was in Venice, having already re-worked much of his earlier libretto which he had written for Nicola Vaccai's 1825 opera, "Giulietta e Romeo", the source for which was the play of the same name by Luigi Scevola in 1818. The two men set to work, but with the winter weather in Venice becoming increasingly bad, Bellini fell ill; however, he had to continue to work under great pressure within a now-limited timetable. Eventually, revisions to Romani's libretto were agreed to, a new title was given to the work, and Bellini reviewed his score of "Zaira" to see how some of the music could be set to the new text, but composing the part of Romeo for Grisi. He also took Giulietta's ""Oh quante volte"" and Nelly's "romanza" from "Adelson e Salvini". The Giulietta was to be sung by Rosalbina Caradori-Allan.