31 BC
31 BC was a decisive year in Roman history marked by the naval Battle of Actium, the consulship of Antony and Octavian, and the beginning of Octavian’s rise to sole power.
31 BC is remembered as a turning point in Roman history. The year is most famous for the naval Battle of Actium, which decisively shifted power from the Roman triumvirs to Gaius Octavian. In Roman practice the year was identified as the Year of the Consulship of Antonius and Octavianus; in later chronological work it is placed in the Julian calendar era and is variously described in surviving sources with different weekday starts and leap-year treatments (Julian calendar).
Key events
- Battle of Actium (2 September): Octavian’s fleet, commanded by Marcus Vipsanius Agrippa, defeated the combined forces of Mark Antony and Cleopatra off western Greece (Actium overview).
- Political consolidation: the battle undermined Antony’s authority and set the stage for Octavian’s campaign in the eastern Mediterranean (political consequences).
- Roman administrative notation: the year continued to be recorded in official and literary sources by the names of its consuls (consular dating).
The naval engagement at Actium is often described in military and naval histories for its tactical use of smaller, more maneuverable vessels and superior seamanship under Agrippa. The defeat forced Antony and Cleopatra to retreat to Egypt, where subsequent events removed them as rival claimants and allowed Octavian to consolidate authority.
Significance and aftermath
Although the formal end of the Roman Republic unfolded over several years, the outcome at Actium in 31 BC is widely regarded as the decisive moment that enabled Octavian to become Rome’s sole ruler and later adopt the title Augustus in 27 BC. The year therefore marks the beginning of a transition from republican collegial rule toward imperial governance (transition).
Contemporary and later writers also note calendar uncertainties for the year—various reconstructions list it as a common or leap year beginning on different weekdays—illustrating limits in reconstructing exact dates from ancient records (chronology).
Notable figures
- Gaius Octavian (later Augustus)
- Marcus Antonius (Mark Antony)
- Cleopatra VII of Egypt
- Marcus Vipsanius Agrippa
Questions and answers
Q: What year was 31 BC?
A: 31 BC was a year in the Julian calendar.
Q: Was 31 BC a common year or a leap year?
A: 31 BC was either a common year or a leap year depending on whether it started on Tuesday, Wednesday, or Thursday.
Q: What was the year known as at the time?
A: At the time, 31 BC was known as the Year of the Consulship of Antonius and Octavianus.
Q: Who were Antonius and Octavianus?
A: Antonius and Octavianus were two Roman consuls who held the office jointly in 31 BC.
Q: What is the Julian calendar?
A: The Julian calendar was a calendar system introduced by Julius Caesar in 45 BC and was used in the Western world until the 16th century.
Q: How many days were in a common year in the Julian calendar?
A: A common year in the Julian calendar had 365 days.
Q: How many days were in a leap year in the Julian calendar?
A: A leap year in the Julian calendar had 366 days, an extra day being added to the month of February.
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Author
AlegsaOnline.com 31 BC Leandro Alegsa
URL: https://en.alegsaonline.com/art/112815