925 John expels the marquis Alberic, lover or husband of Marozia. Marozia’s power increases. She seizes the castle of St. Angelo. On death of Alberic she marries Duke Guido of Tuscany.
926 Treaty between Hugo of Provence and John.
928 John imprisoned by Marozia’s party, and dies, probably by violence. Leo VI.
929 Stephen VII.
931 John XI, son of Marozia and Sergius III or Alberic, elected through his mother’s influence. Guido is dead, and Marozia marries Hugo of Provence.
932 Rome rebels at this. Alberic, brother of the pope, casts him and Marozia into prison, and makes himself master of Rome. Alberic marries the daughter of Hugo.
936 Death of John in prison. He has exercised his spiritual functions, but the government of Rome has been conducted by Alberic. Leo VII.
939 Stephen VIII.
941 Martin III.
946 Agapetus II. These four are appointed by the sole will of Alberic—they have no power.