Rome: From Republic to Empire
In 31 BC Octavian, the adopted son of Julius Caesar, defeated Cleopatra and Mark Anthony at Actium. This brought the last civil war of the republic to an end. Although it was hoped by many that the republic could be restored, it soon became clear that a new political system was forming: the emperor became the focus of the empire and its people. Although, in theory, Augustus (as Octavian became known) was only the first citizen and ruled by consent of the Senate, he was in fact the empire's supreme authority. As emperor he could pass his powers to the heir he decreed and was a king in all but name.
The empire, as it could now be called, enjoyed unparalleled prosperity as the network of cities boomed, and goods, people and ideas moved freely by land and sea. Many of the masterpieces associated with Roman art, such as the mosaics and wall paintings of Pompeii, gold and silver tableware, and glass, including the Portland Vase, were created in this period. The empire ushered in an economic and social revolution that changed the face of the Roman world: service to the empire and the emperor, not just birth and social status, became the key to advancement.
Successive emperors, such as Tiberius and Claudius, expanded Rome's territory. By the time of the emperor Trajan, in the late first century AD, the Roman empire, with about fifty million inhabitants, encompassed the whole of the Mediterranean, Britain, much of northern and central Europe and the Near East.