The Nerva–Antonine dynasty comprised seven Roman emperors who ruled from 96 to 192 AD: Nerva (96–98), Trajan (98–117), Hadrian (117–138), Antoninus Pius (138–161), Marcus Aurelius (161–180), Lucius Verus (161–169), and Commodus (180–192). The first five of these are commonly known as the "Five Good Emperors". The first five of the six successions within this dynasty were notable in that the reigning Emperor did not have a male heir, and had to adopt the candidate of his choice to be his successor. Under Roman law, an adoption established a bond legally as strong as that of kinship. Because of this, all but the first and last of the Nerva–Antonine emperors are called Adoptive Emperors. The importance of official adoption in Roman society has often been considered a conscious repudiation of the principle of dynastic inheritance and has been deemed one of the factors of the period's prosperity. However, this was not a new practice. It was common for patrician families to adopt, and Roman emperors had adopted heirs in the past: the Emperor Augustus had adopted Tiberius, and the Emperor Claudius had adopted Nero. Julius Caesar, dictator perpetuo and considered to be instrumental in the transition from Republic to Empire, adopted Gaius Octavius, who later became Augustus, Rome's first emperor. Moreover, there were often still family connections: Trajan adopted his first cousin once removed and great-nephew by marriage Hadrian, Hadrian made his half-nephew by marriage Antoninus Pius heir, and the latter adopted both Hadrian's half-great-nephew by marriage Marcus Aurelius (Antonius' nephew by marriage) and the son of Hadrian's original planned successor, Lucius Verus. Marcus Aurelius's naming of his son Commodus as heir was considered to be an unfortunate choice and the beginning of the Empire's decline. With the murder of Commodus in 192, the Nerva–Antonine dynasty came to an end; it was followed by a period of turbulence known as the Year of the Five Emperors. History Nerva–Trajan dynasty Nerva was the first of the dynasty. Though his reign was short, it saw a partial reconciliation between the army, the senate and the commoners. Nerva adopted as his son the popular military leader Trajan. In turn, Hadrian succeeded Trajan; he had been the latter's heir presumptive, and averred that he had been adopted by him on Trajan's deathbed. Antonine dynasty The Antonines are four Roman Emperors who ruled between 138 and 192: Antoninus Pius, Marcus Aurelius, Lucius Verus and Commodus. In