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The closing cabaletta "Era desso il figlio mio" was added by Donizetti upon insistence by renowned soprano Henriette Méric-Lalande, who created the role of Lucrezia Borgia. It is one of the most demanding arias in all the operatic repertoire, with trills and coloratura passages that demand extreme vocal agility. Donizetti later removed the aria because he believed it damaged the credibility of the ending.