COUNT FRANCESCO CENCI. GIACOMO, BERNARDO, HIS SONS. CARDINAL CAMILLO. PRINCE COLONNA. ORSINO, A PRELATE. SAVELLA, THE POPE'S LEGATE. OLIMPIO, MARZIO, ASSASSINS. ANDREA, SERVANT TO CENCI. NOBLES. JUDGES. GUARDS, SERVANTS. LUCRETIA, WIFE OF CENCI AND STEP-MOTHER OF HIS CHILDREN. BEATRICE, HIS DAUGHTER. THE SCENE LIES PRINCIPALLY IN ROME, BUT CHANGES DURING THE FOURTH ACT TO PETRELLA, A CASTLE AMONG THE APULIAN APENNINES. TIME. DURING THE PONTIFICATE OF CLEMENT VIII