Second Triumvirate
In a meeting near Bononia in October 43 BC, Octavian joined with Antony and Lepidus to form the triumvirate, ostensibly for the stability of the Roman Republic, and on 27 November the lex Titia legitimized their agreement for five years. The triumvirate gave the men consular power, the right to appoint magistrates, and allowed their division among themselves of the provinces not under the control of the liberatores in the east. Octavian had previously been engaged to Servilia, daughter of Servilius Isauricus, but instead became engaged to Claudia, stepdaughter of Antony, to solidify their political union. Octavian also relinquished the consulship to Antony's ally Publius Ventidius.
The triumvirs then set in motion proscriptions, targeting some 300 men as outlaws, divided roughly evenly between senators and equestrians. Thousands more had their properties confiscated. Contemporary Roman historians provide conflicting reports as to which triumvir was most responsible for the proscriptions and killing. However, the sources agree that the proscriptions enabled all three to eliminate political enemies.
The triumvirs initiated the proscriptions partly to raise money to pay the salaries of their troops for the upcoming conflict against Caesar's assassins Marcus Brutus and Gaius Cassius, but the main intention was the removal of wartime rivals. The triumvirs seized the proscripts' property. However much money was raised was insufficient, so the triumvirs introduced a range of new taxes to fund their war. They reinstituted property taxes and created new imposts on slaves, before also demanding property assessments for taxes on rich women that were reduced after a public protest of women in Rome.
On 1 January 42 BC, with Lepidus as consul, the Senate posthumously recognized Julius Caesar as a divinity of the Roman state, divus Iulius. Octavian was able to further his cause by emphasizing that he was divi filius ('son of the divine'). Antony and Octavian then led twenty-eight legions east against Brutus and Cassius, whom they defeated after two battles at Philippi in Macedonia in October 42 BC. Brutus and Cassius both died by suicide. Claiming responsibility for both victories, Antony branded Octavian a coward for handing over his direct military control to Marcus Vipsanius Agrippa. Octavian was bedridden with illness during the first battle, allegedly removing himself from command over the camp per his doctor's advice, but captured Brutus's camp during the second battle.
After Philippi, the triumvirs again divided the provinces. Lepidus was suspected of colluding with Sextus Pompey, the renegade general whom the anti-Caesarian Senate had given command over all Mediterranean coastlines in 43 BC. Cisalpine Gaul was combined with Italia and given to Octavian along with the provinces of Hispania Citerior and Hispania Ulterior that Lepidus had to forfeit. Antony travelled east to Egypt where he allied himself with Cleopatra, a Roman client ruler, former lover of Julius Caesar, and mother of Caesar's son Caesarion. In addition to the eastern provinces, Antony controlled Gallia Comata and took Gallia Narbonensis from Lepidus, who was left with the province of Africa.
Octavian was left to settle tens of thousands of discharged veterans in Italy. Those who fought for the assassins also required settlement for their pacification. With no remaining public land, Octavian chose to confiscate land from citizens, instead of alienating the soldiers who could mount a real threat to the regime in Italy. The settlements affected some eighteen cities, with entire populations fully or partially evicted.
These veteran settlements brought Octavian widespread dissatisfaction. The disaffected rallied to Mark Antony's brother Lucius Antonius, who was supported by a majority in the Senate. Meanwhile, Octavian asked for a divorce from Claudia, Antony's stepdaughter. He returned Claudia to her mother, Fulvia, claiming that their marriage had never been consummated. Fulvia and Lucius Antonius then raised an army in Italy to fight for Antony's rights against Octavian. Lucius even briefly took Rome, forcing Lepidus and his two legions to flee the city. However, the Roman army still depended on the triumvirs for their salaries. Lucius and his allies ended up in a defensive siege at Perusia, where Octavian forced their surrender in February 40 BC. Octavian spared Lucius, while Fulvia fled to Sicyon in Greece and died shortly afterwards. On 15 March, the anniversary of Julius Caesar's assassination, Octavian had 300 Roman senators and equestrians executed for allying with Lucius. Perusia was also sacked, though it is unclear who started the fires. These reprisals sullied Octavian's reputation.
Sextus Pompey affirmed his control of Sicily as part of an agreement with the triumvirate in 40 BC, and gained control of Sardinia and Corsica in 39. Both Antony and Octavian sought an alliance with him. Octavian established a temporary alliance in 40 BC when he married Scribonia, an aunt of Sextus's wife. A year later, Scribonia gave birth to Octavian's only surviving child, Julia, on the same day that he divorced her to marry Livia Drusilla. When Livia began her affair with Octavian, she was already married to Tiberius Claudius Nero, had a son Tiberius with Nero, and was pregnant with their second child. She gave birth to her second son, Drusus, several months after her divorce from Nero and marriage to Octavian. Livia later had another child with Octavian, who was born prematurely and did not survive.
While in Egypt, Antony had engaged in an affair with Cleopatra and had fathered three children with her. Antony's Gallic provinces fell into Octavian's hands after the death of Antony's legate Quintus Calenus in 40 BC. Aware of his deteriorating relationship with Octavian, Antony left Cleopatra; he sailed to Italy in 40 BC with a large force to oppose Octavian, laying siege to Brundisium, but the men's revolting armies forced them to reconcile. In late 40, the triumvirs divided the empire between Antony in the east, Octavian in the west, and Lepidus in Africa. Now in a stronger position due to the Parthian threat in Antony's provinces, Octavian gave his sister, Octavia Minor, in marriage to Antony.
Before the battles of Philippi, Octavian had sent Salvidienus Rufus to remove Sextus Pompey from Sicily, but after Rufus's defeat, the triumvirs recognized Sextus's Mediterranean command at Brundisium in 40 BC. When Sextus resumed his blockade, a starving angry mob in Rome blamed Octavian and Antony and attacked them in early 39 BC; Antony's forces rescued Octavian and dispersed the mob. Another temporary peace agreement was reached in 39 BC at Misenum. Sextus lifted the blockade on Italy once Octavian granted him Sardinia, Corsica, Sicily, and the Peloponnese and ensured him a future position in the consulship.
The agreement between the triumvirate and Sextus began to crumble when Octavian divorced Scribonia and married Livia in 38 BC. After Antony refused to relinquish the Peloponnese, Sextus reimposed his blockade, starting food riots at Rome. Sextus's naval commander Menas defected, handing over Corsica and Sardinia. However, after Octavian's naval forces were defeated at Cumae, Octavian lacked the resources to confront Sextus alone, so he sought Antony's help, extending their terms for another five-year period beginning in 37 BC.
In supporting Octavian, Antony expected to gain support for his own campaign against the Parthians. At Tarentum in mid-37 BC, Antony provided 120 ships for Octavian to use against Sextus, while Octavian was to send 20,000 legionaries to Antony for use against Parthia. Two years later Octavian sent only a tenth of those promised, which Antony viewed as a provocation. Meanwhile, Octavian tasked Agrippa with creating the artificial harbor Portus Julius for the training and shipbuilding of Octavian's naval fleet.
Octavian and Lepidus launched a joint operation against Sextus in Sicily in 36 BC. Octavian was shipwrecked in Sicily, but Agrippa defeated Sextus at Mylae in August before almost destroying Sextus's forces at Naulochus in September. Sextus fled to the east, but Antony had him executed at Miletus in 35 BC.
As Lepidus and Octavian accepted the surrender of Sextus's troops, Lepidus attempted to claim Sicily for himself. However, Lepidus's troops deserted him after Octavian bribed them. Octavian forced Lepidus into retirement but allowed him to remain pontifex maximus ('supreme pontiff'). Octavian protected Roman citizens' rights to property, settled his discharged soldiers outside Italy, and returned 30,000 slaves to their former Roman owners after they had fled to join Sextus's army and navy. To ensure his family's safety once he returned to Rome, he had the Senate grant him, his wife, and his sister tribunician immunity, or sacrosanctitas.
After defeating Sextus, Octavian campaigned in Illyricum (in what is now Croatia). During the first campaign in 35 BC he destroyed Segesta (modern Siscia) and was wounded by a collapsing siege ramp when he besieged Metulum (along the Kolpa River). The Senate lauded these efforts, though Octavian postponed a triumph for his victories, and only later acknowledged the contributions of commanders Agrippa and Statilius Taurus.
In 36 BC, Octavian declared the civil wars at an end and suggested that he and Antony resign as triumvirs; Antony refused. Antony's Parthian campaign in 36 BC turned into a debacle and ruined his reputation. The mere 2,000 legionaries sent by Octavian to Antony, traveling with his wife Octavia, were hardly enough to replenish his lost forces. On the other hand, Cleopatra, with her enormous wealth, could restore his army to full strength. Her and Antony's third child, Ptolemy Philadelphus, was born in 36 BC, so in 35 BC Antony decided to send Octavia back to Rome. Octavian attacked Antony for rejecting his Roman spouse for a foreign queen. He also sought to convince the Senate that Antony had ambitions to diminish the preeminence of Rome. When Octavian assumed the consulship of 33 BC, he opened the Senate with a vehement attack on Antony's grants of titles and territories to his relatives and Cleopatra, later known as the Donations of Alexandria.
In early 32 BC, amid an intense war of propaganda with Octavian, Antony divorced Octavia. The new consuls Gaius Sosius and Gnaeus Ahenobarbus supported Antony and threatened to revoke Octavian's triumviral authority. This prompted Octavian to enter the Senate house and denounce Antony and Sosius; both consuls and many senators then fled Rome for Antony. However, two of Antony's key supporters, Munatius Plancus and Marcus Titius, defected to Octavian in autumn. They offered him vital information about Antony's will, which Antony published after marching on the Temple of Vesta. The will would have given away Roman-conquered territories as kingdoms for his sons to rule and designated Alexandria as the site of a tomb for him and Cleopatra.
In late 32 BC, the Senate revoked Antony's upcoming consulship and declared war on Cleopatra. Octavian used emergency powers to have men of military age throughout the Republic swear an oath of loyalty to him. In early 31 BC, as Antony and Cleopatra moved to Greece, Octavian's forces under Agrippa transited the Adriatic Sea, and cut off their main force from their supply routes in the Ionian Sea. Octavian then landed in Epirus, and proceeded to march south. Trapped on land and sea, Antony's men started to desert as Octavian prepared for battle.
Antony's fleet sailed through the bay of Actium along the Ambracian Gulf of western Greece to break the blockade. There, they fought the Battle of Actium on 2 September 31 BC. Cleopatra and her portion of the fleet withdrew early in the battle and Antony later joined them; Cleopatra's fleet spared Antony's remaining forces in a last-ditch effort. Antony's nearby forces on land surrendered to Octavian after attempting a retreat through Macedonia. Various client kings now defected to Octavian. Octavian would later establish a new city—Nicopolis ('victory city')—near the site of the battle at Actium.
On 1 August 30 BC, Octavian defeated Antony at Alexandria; Antony then died by suicide. After meeting with Octavian and refusing to be paraded in a triumph at Rome, Cleopatra took her own life with poison. Well aware of the dangers presented by another potential heir to Caesar, Octavian ordered the death of Cleopatra's son Caesarion. He also had Antony's son Marcus Antonius Antyllus killed, but spared their other children and pardoned many of his opponents. Octavian had previously shown little mercy to surrendered enemies. He also ensured that Cleopatra was buried with Antony in their tomb. He appointed Cleopatra's daughter Cleopatra Selene II and her husband, Juba II of Numidia, as the new co-rulers of Mauretania following their marriage in 25 BC.