The final war of the Roman Republic, also known as Antony's civil war or the war between Antony and Octavian, was the last of the Roman civil wars of the republic, fought between Cleopatra (assisted by Mark Antony) and Octavian. After the Roman Senate declared war on the Egyptian queen Cleopatra, Antony, her lover and ally, betrayed the Roman government and joined the war on Cleopatra’s side. After the decisive victory for Octavian at the Battle of Actium, Cleopatra and Antony withdrew to Alexandria, where Octavian besieged the city until both Antony and Cleopatra committed suicide.