One of the most powerful civilizations in history, the Roman Empire roled the world for more than five centuries. Although renowned for its military prowess, Rome s real power stemmed from its unprecedented mastery of urban planning and engineering. Chronicles Rome s spectacular structural history from the rise of Julius Caesar in 55 BC to the Empire s eventual collapse in c. 537 AD. Each of Rome s legendary rulers left their mark on the city--some stately, some sordid--and their collective ambition caused a surge of innovation and ingenuity that led to Rome s glorious ascendance. Examine the planning and construction of the city s greatest masterpieces, including the awe-inspiring Colosseum and its mysterious subterranean aqueducts, and piece together Rome s magnificent past through its architectural triumphs. The Roman Empire (Latin: Imperium Romanum) was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings around the Mediterranean in Europe, Africa, and Asia. The 500-year-old Roman Republic, which preceded it, had been destabilized through a series of civil wars. Several events marked the transition from Republic to Empire, including Julius Caesar's appointment as perpetual dictator (44 BC); the Battle of Actium (2 September 31 BC); and the granting of the honorific Augustus to Octavian by the Roman Senate (16 January 27 BC). The first two centuries of the Empire were a period of unprecedented stability and prosperity known as the Pax Romana ("Roman Peace"). It reached its greatest expanse during the reign of Trajan (98--117 AD). In the 3rd century, the Empire underwent a crisis that threatened its existence, but was reunified and stabilized under the emperors Aurelian and Diocletian. Christians rose to power in the 4th century, during which time a system of dual rule was developed in the Latin West and Greek East. After the collapse of central government in the West in the 5th century, the eastern half of the Roman Empire continued as what would later be known as the Byzantine Empire. Because of the Empire's vast extent and long endurance, the institutions and culture of Rome had a profound and lasting influence on the development of language, religion, architecture, philosophy, law, and forms of government in the territory it governed, particularly Europe, and by means of European expansionism throughout the modern world. Rome had begun annexing provinces in the 3rd century BC, four centuries before reaching its greatest territorial extent, and in that sense was an "empire" while still governed as a republic. Republican provinces were administered by former consuls and praetors, who had been elected to one-year terms and held imperium, "right of command". The amassing of disproportionate wealth and military power by a few men through their provincial commands was a major factor in the transition from republic to imperial autocracy. Later, the position of power held by the emperor was expressed as imperium. The Latin word is the origin of English "empire," a meaning it began to acquire only later in Rome's history. The Augustus of Prima Porta (early 1st century AD) As the first emperor, Augustus took the official position that he had saved the Republic, and carefully framed his powers within republican constitutional principles. He rejected titles that Romans associated with monarchy, and instead referred to himself as the princeps, "leading citizen". Consuls continued to be elected, tribunes of the people continued to put forth legislation, and senators still debated in the curia. It was Augustus, however, who established the precedent that the emperor controlled the final decisions, backed up by military force. The reign of Augustus, lasting more than 40 years, was portrayed in Augustan literature and art as a new "Golden Age." Augustus laid out an enduring ideological foundation for the three centuries of the Empire known as the Principate (27 BC--284 AD), the first 200 years of which is traditionally regarded as the Pax Romana. During this period, the cohesion of the Empire was furthered by participation in civic life, economic ties, and shared cultural, legal and religious norms. Uprisings in the provinces were infrequent, but put down "mercilessly and swiftly" when they occurred, as in Britain and Gaul. The sixty years of Jewish--Roman wars in the first half of the 2nd century were exceptional in their duration and violence. The success of Augustus in establishing principles of dynastic succession was limited by his outliving a number of talented potential heirs: the Julio-Claudian dynasty lasted for four more emperors—Tiberius, Caligula, Claudius, and Nero—before it yielded in 69 AD to the strife-torn Year of Four Emperors, from which Vespasian emerged as victor.

• published: 12 Dec 2013
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