Given the need at the time for composers to take into account singers' strengths and weaknesses, Verdi's writing for the four principals (rather than the more conventional three of that era) who became the cast for the premiere of "Oberto" well accommodated the limitations of Mary Shaw's voice and played to the strengths of Antonietta Rainieri-Marini's in the lower register. Ignazio Marini, the bass who sang the title role, was "a performer of impressive vocal and dramatic range, for whom Verdi would later write the title role of "Attila", notes Parker. He continues by adding that "la Marini" was undoubtedly grateful to Verdi in that it was she who quite probably helped to secure most of the revivals of the opera during the following few years where she appeared as Leonora in four of the five of them.