sentences:  The names of the two lovers 'Henri' and 'Hélène' (which by that time had been used in "Les vêpres siciliennes") were changed to 'Marcello' and 'Amelia'.When Donizetti abandoned the opera, he re-cycled the famous tenor aria, 'Ange si pur' ( 'Spirto gentil' in the Italian version) for his 1840 opera "La favorite".For the premiere, Salvi composed a replacement aria, 'Angelo casto e bel'.