sentences:  The opera remained unfinished at the time of his death in 1848.Although abandoned for the Opéra and still incomplete, Donizetti felt that his contract for this opera had been broken and, in late May 1845, decided to leave Vienna for Paris where he would claim a forfeit from the Opéra for its non-production, which was still unfinished, as was the libretto.He left Vienna for the last time on 10 July 1845, but appears to have done nothing about the claim when he arrived in Paris, and his final illness soon claimed him.