五賢帝
Roman expansion began long before the state was changed into an Empire and reached its zenith under emperor Trajan with the conquest of Mesopotamia and Armenia in AD 113. The period of the "Five Good Emperors" saw a successions of peaceful years and the Empire was prosperous. Each emperor of this period was adopted by his predecessor. The Nerva–Antonine dynasty was a dynasty of seven consecutive Roman Emperors who ruled over the Roman Empire from 96 to 192. These Emperors are Nerva, Trajan, Hadrian, Antoninus Pius, Marcus Aurelius, Lucius Verus, and Commodus.