Augustus ( /ɔːˈɡʌstəs/;Classical Latin: [awˈɡʊstʊs]; Latin: Imperator Gaius Julius Caesar Augustus; 23 September 63 BC – 19 August AD 14) is considered the first emperor of the Roman Empire, which he ruled alone from 27 BC until his death in 14 AD. Born Gaius Octavius Thurinus, he was adopted posthumously by his great-uncle Gaius Julius Caesar in 44 BC via his last will and testament, and between then and 27 BC was officially named Gaius Julius Caesar. In 27 BC the Senate awarded him the honorific Augustus ("the revered one"), and thus consequently he was Gaius Julius Caesar Augustus.

The young Octavius came into his inheritance after Caesar's assassination in 44 BC. In 43 BC, Octavian joined forces with Mark Antony and Marcus Aemilius Lepidus in a military dictatorship known as the Second Triumvirate. As a triumvir, Octavian ruled Rome and many of its provinces. The triumvirate was eventually torn apart under the competing ambitions of its rulers: Lepidus was driven into exile, and Antony committed suicide following his defeat at the Battle of Actium by Octavian's fleet under the command of Agrippa in 31 BC.

Mark Antony (Latin: M·ANTONIVS·M·F·M·N) (January 14, 83 BC – August 1, 30 BC) was a Roman politician and general. As a military commander and administrator, he was an important supporter and loyal friend of his mother's cousin Julius Caesar. After Caesar's assassination, Antony formed an official political alliance with Octavian (the future Augustus) and Lepidus, known to historians today as the Second Triumvirate.

The triumvirate broke up in 33 BC. Disagreement between Octavian and Antony erupted into civil war, the final war of the Roman Republic, in 31 BC. Antony was defeated by Octavian at the naval Battle of Actium, and in a brief land battle at Alexandria. He and his lover Cleopatra committed suicide shortly thereafter. His career and defeat are significant in Rome's transformation from Republic to Empire.

A member of the Antonia clan (gens), Antony was born on January 14, 83 BC. He was the homonymous and thus presumably the eldest son of Marcus Antonius Creticus (praetor 74 BC, proconsul 73–71 BC) and grandson of the noted orator Marcus Antonius (consul 99 BC, censor 97–6 BC) who had been murdered during the Marian Terror of the winter of 87–6 BC.