How did vespasian grant stability to Rome?

Answer 1

Vespasian restored stability rather than grant it. Stability is not something you grant. He did so by being final the winner of a power struggle which historians call the year of the four emperors, a brief period of civil war in which four men succeeded each other. Galba was acclaimed as emperor. Six months latee he was assassinated by the Praetorian (imperial) Guard, which disgruntled and which had been bribed by Otho, whom they hailed as emperor. Otho was challenged by Vitellius, the governor of Germania, who three months later defeated and deposed him. The legions stationed in the east, Syria, Judea and Egypt acclaimed Vespasian as emperor. He marched on Rome with the eastern legions. Meanwhile, the legions stationed in Rhaetia and Noricum (roughly Switzerland, Austria and part of southern Germany) also acclaimed him as emperor and invaded Italy. They defeated the forces of Vitellius and then reached Rome. Vitellius was killed and Vespasian was declaring emperor. He remained in power because he had the support of the majority of the legions and no one challenged him militarily.