N.P.O.
- Octavian (C. Julius Cæsar Octavianus), appointed heir to Cæsar, [249];
- comes to Rome, and claims the inheritance, [254];
- collects an army, [254];
- elected Consul, [255];
- forms Triumvirate with Antony and Lepidus, [256];
- proscriptions, [256-7];
- defeats Brutus at Philippi, [261];
- returns to Rome, [263];
- reconciliation with Antony, [264];
- his fleet destroyed by Sextus Pompey, [265];
- renews the Triumvirate, [266];
- subdues the Dalmatians, [267];
- rupture with Antony, [267];
- defeats Antony and Cleopatra at Actium, [268];
- his Triumph, [270];
- Imperator for life, Princeps, Augustus, Pontifex Maximus, [270];
- end of the Republic, [270].
- Octavius. See Octavian.
- Octavius, Cn., conflict with Cinna, [185];
- slain, [185].
- Oppian Law repealed, [130].
- Orosius, [348].
- Ostia founded, [15].
- Ostrogoths obtain permission to cross the Danube, [338].
- Otho, Salvius, [302].
- Ovid banished, [203].
- Ovidius Naso, P. (poet), [281].