The 12 months known in history as the Year of the Four Emperors was a pivotal chapter in the long epoch of the Roman Empire. It marked the tumultuous end of the Julio-Claudian Dynasty and the advent of a year of civil war, renewal and realignment, the result of which was the establishment of a new era and the founding of a new (and arguably more rational and responsible) imperial dynasty.
The controversial year began with the decline of the Julio-Claudian dynasty under the rule of Emperor Nero, the last ruler of a dynasty founded by Julius Caesar, who was perhaps the most famous Roman emperor that never was. The Julio-Claudian succession included such names as Augustus, Tiberius, Caligula, Claudius, and of course Nero, names that resonate with great power throughout the chronicles of Roman history, in many cases thanks to the violence, madness, misrule and decadence that seemed to take root at the center of imperial Rome at the dawn of the common era.
Having left no heir, Nero's death plunged the empire into confusion and chaos, bringing to an end the Julio-Claudian lineage while at the same time offering no clear rule of succession. This presented the opportunity for influential individuals in the empire, and in particular provincial governors who also commanded large military garrisons, to express and further their own ambitions to power. The result was a period of instability and civil war as several pretenders to the throne, among them the emperors Galba, Otho and Vitellius, gained and lost power, until finally the emperor Vespasian seized and retained the imperial principate. Vespasian imposed order and discipline on a chaotic empire and founded the Flavian Dynasty, which survived until 96, encompassing the reigns of Vespasian and his two sons, Titus (79–81) and Domitian (81–96).