4. Pompey secured the Mediterranean for Rome
When Sulla returned to Italy from the war against Pontus, Pompey joined him with three legions to march on and seize of Rome. Sulla then sent him to recapture Sicily and Africa from the Marians, which he accomplished in two lightning campaigns by 81 BC. Pompey then executed the captured Marians and was named Magnus, or “the Great” by his troops. After Sulla’s retirement, Pompey menaced the Senate into appointing him commander of the war against the final Marian remnants in Hispania, which he eventually won after considerable effort by 71 BC.
Pompey returned to Italy with his army, ostensibly to help put down Spartacus’ slave revolt, but in reality to guarantee his election to the consulship in 70 BC. In 67 BC, he was given authority throughout the Mediterranean to settle a piracy problem that had grown out of control. He did so in a brilliant campaign that lasted only three months. Pompey was then appointed to command a war against Pontus, and was granted authority to settle the entire Eastern Mediterranean. He accomplished that by annexing some kingdoms into the Roman Republic, and reducing others to client states.