31 BC

31 BC in other calendars
Gregorian calendar	31 BC; XXX BC
Ab urbe condita	723
Ancient Egypt era	XXXIII dynasty, 293
- Pharaoh	Cleopatra VII, 21
Ancient Greek era	187th Olympiad, year 2
Assyrian calendar	4720
Balinese saka calendar	N/A
Bengali calendar	−623
Berber calendar	920
Buddhist calendar	514
Burmese calendar	−668
Byzantine calendar	5478–5479
Chinese calendar	己丑年 (Earth Ox); 2666 or 2606; — to —; 庚寅年 (Metal Tiger); 2667 or 2607
Coptic calendar	−314 – −313
Discordian calendar	1136
Ethiopian calendar	−38 – −37
Hebrew calendar	3730–3731
Hindu calendars
- Vikram Samvat	26–27
- Shaka Samvat	N/A
- Kali Yuga	3070–3071
Holocene calendar	9970
Iranian calendar	652 BP – 651 BP
Islamic calendar	672 BH – 671 BH
Javanese calendar	N/A
Julian calendar	31 BC; XXX BC
Korean calendar	2303
Minguo calendar	1942 before ROC; 民前1942年
Nanakshahi calendar	−1498
Seleucid era	281/282 AG
Thai solar calendar	512–513
Tibetan calendar	阴土牛年; (female Earth-Ox); 96 or −285 or −1057; — to —; 阳金虎年; (male Iron-Tiger); 97 or −284 or −1056

Millennium:	1st millennium BC
Centuries:	2nd century BC – 1st century BC – 1st century
Decades:	60s BC 50s BC 40s BC – 30s BC – 20s BC 10s BC 0s BC
Years:	34 BC 33 BC 32 BC – 31 BC – 30 BC 29 BC 28 BC

Year 31 BC was either a common year starting on Tuesday, Wednesday or Thursday or a leap year starting on Tuesday or Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Antonius and Octavianus.

Events

Gaius Julius Caesar Octavian becomes Roman Consul for the third time. His partner is Marcus Valerius Messalla Corvinus, replacing Mark Antony.
Octavian establishes a bridgehead at the Gulf of Ambracia
Marcus Vipsanius Agrippa sailed with 300 war galleys to the western Peloponnese. He occupied the Gulf of Corinth to cut off Antony's line of communication.
Antony sets up camp at the promontory of Actium.
Agrippa stormed Leucas. He took the garrison at Patrae.
The Egyptian fleet retreats to Taenarus.
Octavian takes court at Samos
In the Judean Desert Herod the Great completes the fortress Masada.
The Hellenistic period in art ends (or AD 14 by some scholars)