B.C.E.  (BEFORE THE COMMON ERA = B.C.)

800           CONVENTIONAL DATE OF THE FOUNDATION OF ROME
500           END OF MONARCHY
300           CONQUEST OF ITALY
200           CONQUEST OF GREECE
100           AUGUSTUS
                                     VERGIL, CICERO, HORACE, LIVY, OVID
                                     (GREEK) PLUTARCH

C.E. (COMMON ERA = A.D.)

300           CONSTANTINE
500           END OF WESTERN ROMAN EMPIRE