Donizetti moves to Paris in 1834-1835 called, along with Bellini, by Rossini in his capacity as co-director of the Théâtre Italien. In 1843 the first symptoms of a brain disease that rapidly and progressively got worse to degenerate during the summer 1845. Subsequent medical treatments made the situation irreparable and in February 1846 the composer was interned in an institution for mentally ill in Paris.
In Stendhal’s opinion Tancredi was Rossini’s best opera. In his biography he wrote: “there’s no bravery or grandeur in this opera but only the simple purity and virginity of genius”. The libretto by Gaetano Rossi was drawn from Voltaire’s tragedy Tancrede. For that libretto Rossini composed an innovative score, combining in an original way the baroque “extreme coloraturas” with the pre-Romantic simple melodies of the new belcanto.