The 30s BC

39 BCE5 entries

• Marcus Antonius dispatches Publius Ventidius Bassus with 11 legions to the East and drives Quintus Labienus out of Asia Minor. Labienus retreats into Syria, where he receives Parthian reinforcements. Ventidius finally defeats him in the battle at the Taurus Mountains.
• Publius Ventidius defeats Pharnastanes with his cataphracts at the Amanus Gates, and goes on to reclaim Syria, Phoenicia and Judea. Labienus flees to Cilicia, where he is captured and executed.

38 BCE7 entries

37 BCE11 entries

• The kingdom of Goguryeo in Korea is founded by the king Dongmyeong. (traditional date)
• Antony reorganizes Asia Minor under strongmen loyal to him. He raises troops from his allies: Amyntas and Archelaus, kings of Galatia and Cappadocia. The old kingdom of Pontus is restored, from Armenia to the River Halys under Polemon I.
• Caesar Augustus (Octavian) engineers the "Second Pact of Tarentum" which renews the Triumvirate for an additional five years. Mark Antony exchanges 120 ships, for service against Sextus Pompeius. Octavian Caesar donates 1,000 troops from the Praetorian Guard and 20,000 legionaries for the Parthian campaign in Syria.

36 BCE18 entries

• June – Mark Antony launches a major offensive against the Parthians, in which he marches with 10 legions and 10,000 cavalry to Carana in Anatolia.
• July – Octavian's fleet (102 warships) embarks from Puteoli and tries to invade Sicily, but it is caught in a storm at Vibo and forced to return.
• September 3 – Battle of Naulochus: Agrippa defeats Sextus Pompeius, a son of Pompeius, in a naval engagement off Naulochus. Sextus escapes with 17 ships to Messana and then to Asia Minor.

35 BCE8 entries

• Pannonia is attacked by Octavian Caesar, who conquers and sacks the stronghold Siscia (Sisak) of the Segestani, which is taken after a 30-day siege. The country is not definitely subdued, however, until 9 BC.
• Azes I, Indo-Scythian ruler, completes the domination of the Scythians in northern India.
• Sextus Pompeius defeats the governor of Asia, Gaius Furnius, with three legions and seizes Nicaea and Nicomedia (modern Izmit).

34 BCE4 entries

• Gaius Julius Caesar Octavian pacifies Dalmatia and Pannonia forming the province of Illyricum, while Antony regains Armenia from Parthia. Octavian reduces the outposts defending the Liburnian town of Promona, sets up siege works and forces its surrender.
• Antony advances into Armenia with an expeditionary force (16 legions) and marches to the capital Artaxata. He arrests king Artavasdes II and takes him to Alexandria.
• Mark Antony becomes Roman Consul for the second time. His partner is Lucius Scribonius Libo. The latter is replaced with Aemilius Lepidus Paullus during the year.

33 BCE8 entries

• Mark Antony annexes the kingdom of Media and arranges the marriage of his son Alexander Helios with princess Iotapa, the daughter of king Artavasdes I.
• Marcus Vipsanius Agrippa is self demoted to Aedile, and builds the Aqua Julia, one of the aqueducts on which Rome's water supply depends, as well as cleaning the Cloaca Maxima sewerage system.
• Gaius Julius Caesar Octavian becomes consul for the second time. His partner is Lucius Volcatius Tullus. Octavian delivers a speech; de summa Republica in the Roman Senate, in which he subjects the Donations.

32 BCE8 entries

• July – The Roman Senate declares war upon Mark Antony and Cleopatra VII. Octavian Caesar is proclaimed dux and the West - Gallic and Spanish provinces, Africa, Sicily and Sardinia - swear an oath (sacramentum) of loyalty to him. In order to assure this oath, Octavian forces the high priest of the Vestal Virgins in Rome to hand over Antony's will, which contains information about the Roman-conquered territories as kingdoms and plans to build a tomb in Alexandria for him and Cleopatra.
• Spring – Final War of the Roman Republic: Mark Antony transfers his headquarters from Samos to Athens, where he assembles a fleet of 500 combat vessels and 300 transport ships, crewed by 150,000 men.
• Winter – Antony distributes garrisons along the west coast of Greece, stations the fleet at Actium and establishes his headquarters at Patrae.

31 BCE16 entries

• September 2 – Roman Civil War: Battle of Actium: Off the western coast of Greece, Octavian Caesar defeats naval forces under Mark Antony and Cleopatra VII.
• Agrippa storms Leucas, giving Octavian an anchorage and a second depot for his land supplies. He seizes the garrison at Patrae, and takes Antony's headquarters.
• Amyntas, king of Galatia, deserts with 2,000 cavalry to Octavian. One-third of Antony's oarsmen are lost to malnutrition, disease and desertion.

30 BCE20 entries

• July 31 – Battle of Alexandria: Mark Antony achieves a minor victory over Octavian's forces, but most of his army subsequently deserts, leading to his suicide.
• August 1 – Octavian Caesar captures Alexandria. This marks the official annexation of Ancient Egypt to the Roman Republic. Cleopatra evacuates her court and treasury to Berenice on the west coast of the Red Sea, but king Malchus of Nabatea attacks from the desert and burns the Egyptian ships.
• August 10 or 12 – With the death of Cleopatra, probably by suicide, in Alexandria and the probable murder soon afterwards of her son and nominal co-ruler Caesarion, the Ptolemaic dynasty, the last of Ancient Egypt, comes to an end. The first year of Octavian's reign in Egypt.