Tiberius, (42 B.C.-37 A.D.), a Roman emperor. He was a brilliant general and an able administrator. He strengthened the empire's economy, established and maintained peace on the frontiers, and provided good government for the provinces. Tiberius was personally unpopular, however, because of his austere nature and his curbs on luxurious living and public spectacles. His many political enemies told scandalous stories about him. Repeated by the historian Tacitus, the vicious gossip for many centuries darkened the reputation of Tiberius, who is considered by some scholars to be one of the greatest of the Roman emperors.

Tiberius Claudius Nero (his full name) was the stepson of the emperor Augustus, whom he succeeded in 14 A.D. at the age of 56, after a military career on the northern frontiers of the empire. Surrounded by the intrigue of power-seeking relatives, Tiberius at the age of 68 sought seclusion by moving to Capri. He retained the emperorship but left details of administration to Sejanus, the commander of the guard. Sejanus, however, was later found to be conspiring against him and was put to death in 31, along with other enemies.

During his final years Tiberius was held in dread by the people of Rome, who had been led by his enemies to believe him a heartless tyrant. His death was greeted with rejoicing. Tiberius was succeeded by his grandnephew, Caligula.