Battle of Actium

The Battle of Actium, fought at sea off the western coast of Greece in 31 BCE, ended the last great contest of Rome's civil wars. Octavian, the adopted heir of Julius Caesar, defeated the combined forces of Mark Antony and Cleopatra VII of Egypt. Within a year he was master of the Mediterranean world, and the sequence of events that followed turned the Roman Republic into a monarchy in all but name.

The roots of the clash lay in the assassination of Caesar in 44 BCE. Octavian, Antony and Lepidus formed the Second Triumvirate, hunted down Caesar's killers, and divided the Roman world among themselves. Lepidus was soon sidelined, leaving Octavian in the west and Antony in the east. Antony's alliance and relationship with Cleopatra, the Ptolemaic queen of Egypt, grew into both a political partnership and a personal one. Octavian exploited this skillfully, portraying Antony as a man seduced by a foreign queen and neglectful of Roman duty. Relations collapsed in the early 30s BCE, and Rome formally declared war on Cleopatra rather than on Antony himself.

Antony and Cleopatra gathered a large fleet and army near Actium, at the mouth of the Ambracian Gulf. Octavian's commander, Marcus Agrippa, was a gifted admiral who cut their supply lines and left them blockaded and short of provisions. In September, Antony's fleet attempted to break out into open water. Details of the fighting are hard to reconstruct, since our main accounts were written later and favored the victors. What is clear is that Cleopatra's squadron and Antony himself slipped through the lines and sailed away, while much of the remaining fleet was destroyed or surrendered. Whether this was a planned escape or a collapse of nerve is debated. Antony's land army, abandoned by its leader, soon went over to Octavian.

Octavian pursued the fugitives to Egypt the following year. Antony and Cleopatra both died by suicide in 30 BCE, and Egypt, enormously rich in grain, became a Roman possession under Octavian's personal control. The age of Hellenistic kingdoms descended from Alexander's generals came to an end.

Actium's greater significance lies in what Octavian did with his victory. With no rival left and the legions loyal to him, he took care to present himself as restorer of the Republic rather than its destroyer. In 27 BCE the Senate granted him the name Augustus, and he held power through a blend of traditional offices and overwhelming military and financial influence. This arrangement, later called the Principate, brought an end to a century of civil strife and laid the foundations of the Roman Empire, which endured in the west for another five centuries.