ROMAN EMPIRE By ibenitez 753 BCE Foundation of Rome 509 BCE The Republic of Rome. It had begun in 509 bce. 27 BCE Cesar Augustus It begun being emperador in the 27 bc. 1 CE Birth of Christ. He was born on the year 0 306 Constantine the Great 379 Theodosius I dead and divide the empire. 474 Romulus, the last emperor of the Occident Roman Empire.