In 1871, Mussorgsky began recasting and expanding the opera with enthusiasm, ultimately going beyond the requirements of the directorate of the Imperial Theatres, which called simply for the addition of a female role and a scene to contain it. He added three scenes (the two Sandomierz scenes and the Kromï Scene), cut one (The Cathedral of Vasiliy the Blessed), and recomposed another (the Terem Scene). The modifications resulted in the addition of an important prima donna role (Marina Mniszech), the expansion of existing female roles (additional songs for the Hostess, Fyodor, and the Nurse), and the expansion of the first tenor role (the Pretender). Mussorgsky augmented his adaptation of Pushkin's drama with his own lyrics, assisted by a study of the monumental "History of the Russian State" by Karamzin, to whom Pushkin's drama is dedicated.