Year of the Four Emperors
With the end of the family of Augustus, some people thought that Rome might go back to being a real Republic again. But nobody really remembered how to do that, and anyway they were too afraid of civil wars. But they got civil wars anyway, for the next year. Nero killed himself in 68 AD with the governor of Spain, Galba, marching on Rome.
So Otho briefly became emperor. He fought Vitellius, but he lost and was killed, and Vitellius became emperor. Vitellius is remembered mostly for his reputation for liking to eat tons of good food.
All three of these emperors had come from the West, and by this time the army in the East, in West Asia, was starting to feel that they should have an emperor who would pay more attention to them.
So they chose their own general, Vespasian, to be emperor. In the fall of 69 AD, one of Vespasian's friends fought Vitellius, and Vitellius was killed, so Vespasian became emperor. Four emperors in one year! People were really afraid the old civil war time was coming back again. So they were glad to settle down with Vespasian as emperor.
Classical Rome, by John Clare (1993). For kids, the whole political history from beginning to end.
The Romans: From Village to Empire, by Mary Boatwright, Daniel Gargola, and Richard Talbert (2004). Okay, it's a little dry, but it is up to date and has all the facts you could want.
The Roman Empire, by Colin Wells (1984). More readable. Alternates chapters on political and social history. Unfortunately, he stops at the third century crisis.
The Year of the Four Emperors, by Kenneth Wellesley (3rd edition 2000).
Vespasian, by Barbara Levick (1999). The only biography of Vespasian in English. Mainly for academics.
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