Scene: Rome, and other Parts of the Empire; in part of the Fourth Act, Persia.
- CHARINUS, Emperor of Rome.
COSROE, King of Persia.
DIOCLES, of a Private Soldier elected Co-Emperor, afterward called DIOCLESIAN.
MAXIMINIAN, Nephew to Diocles, and Emperor by his Donation.
VOLUTIUS APER, Murderer of Numerianus, the late Emperor.
NIGER, a noble Soldier, Servant to the Emperor.
CAMURIUS, A Captain, and creature of Aper.
GETA, a Jester, Servant to Diocles, a merry Knave.
AURELIA, Sister to Charinus.
CASSANA, Sister to Cosroe, a Captive, waiting on Aurelia.
DELPHIA, a Prophetess.
DRUSILLA, Niece to Delphia, in Love with Diocles.