Donizetti considered Dom Sébastien, Roi de Portugal (1843), his final completed opera written for the Paris Opéra, to be his masterpiece. In spite of its relative obscurity, on the basis of this recording, one is inclined to agree with him. The opera has several attributes that in the past have proved to be obstacles to its popularity. The first is its length – it's in five substantial acts and lasts three hours, but that's not so onerous for contemporary audiences accustomed to Wagner and Strauss. Besides, the composer created an abbreviated version for Viennese audiences, who at that time wanted to be out of the theater by 10 p.m., and that version could be used if necessary.