Tiberius (ruled 14–37), during whose reign Christ was crucified, was a soldier and administrator of proved capability but of a reserved and moody temperament that engendered misunderstanding and unpopularity. Slander blamed him for the death in 19 of his nephew and heir apparent, the popular Germanicus; and, when informers (delatores), who functioned at Rome like public prosecutors, charged notables with treason, Tiberius was thought to encourage them. By concentrating the praetorian cohorts in a camp adjoining Rome, he increased the soldiers’ scope for mischief-making without building any real security, and in 26 he left Rome permanently for the island of Capreae (Capri), entrusting Rome to the care of the city prefect. Tiberius heeded the aged Augustus’ advice and did not extend the empire. (The annexation of Cappadocia, a client kingdom, represented no departure from Augustan policy.) In general he took his duties seriously; however, by administering the empire from Capreae he offended the Senate and was never fully trusted, much less really liked. At his death he was not pronounced divus. His great-nephew, Germanicus’ son Gaius, succeeded him.
Gaius (better known by his nickname, Caligula, meaning Little Boot) ruled from 37 to 41 with the absolutism of an Oriental monarch: his short reign was filled with reckless spending, callous murders, and humiliation of the Senate. Gaius’ foreign policy was inept. Projected annexation proved abortive in Britain; it touched off heavy fighting in Mauretania. In Judaea and Alexandria, Gaius’ contemptuous disregard of Jewish sentiment provoked near rebellion. When assassination ended his tyranny, the Senate contemplated restoration of the republic but was obliged by the Praetorian Guard to recognize Claudius, Germanicus’ brother and therefore Gaius’ uncle, as emperor.
Claudius I (ruled 41–54) went far beyond Augustus and Tiberius in centralizing government administration and, particularly, state finances in the imperial household. His freedmen secretaries consequently acquired great power; they were in effect directors of government bureaus. Claudius himself displayed much interest in the empire overseas; he enlarged it significantly, incorporating client kingdoms (Mauretania in 42; Lycia, 43; Thrace, 46) and, more important, annexing Britain. Conquest of Britain began in 43, Claudius himself participating in the campaign; the southeast was soon overrun, a colonia established at Camulodunum (Colchester) and a municipium at Verulamium (St. Albans), while Londinium (London) burgeoned into an important entrepôt. Claudius also promoted Romanization, especially in the western provinces, by liberally granting Roman citizenship, by founding coloniae, and by inducting provincials directly into the Senate—he became censor in 47 and added to the Senate men he wanted, bestowing appropriate quaestorian or praetorian rank upon them to spare the maturer ones among them the necessity of holding junior magistracies; lest existing senators take offense, he elevated some of them to patrician status (a form of patronage often used by later emperors). Claudius’ provincial policies made the primacy of Italy less pronounced, although that was hardly his aim. In fact, he did much for Italy, improving its harbours, roads, and municipal administration and draining its marshy districts. The execution of many senators and equites, the insolence and venality of his freedmen, the excessive influence of his wives, and even his bodily infirmities combined to make him unpopular. Nevertheless, when he died (murdered probably by his fourth wife, Julia Agrippina, Augustus’ great-granddaughter, who was impatient for the succession of the 16-year-old Nero, her son by an earlier marriage), he was pronounced divus.
Nero (ruled 54–68) left administration to capable advisers for a few years but then asserted himself as a vicious despot. He murdered successively his stepbrother Britannicus, his mother Julia Agrippina, his wife Octavia, and his tutor Seneca. He also executed many Christians, accusing them of starting the great fire of Rome in 64 (this is the first recorded Christian persecution). In Rome his reliance on Oriental favourites and his general misgovernment led to a conspiracy by Gaius Calpurnius Piso in 65, but it was suppressed, leading to yet more executions; the victims included the poet Lucan. The empire was not enlarged under this unwarlike emperor, but it was called upon to put down serious disorders. In Britain in 60–61 the rapacity and brutality of Roman officials provoked a furious uprising under Queen Boudicca; thousands were slaughtered, and Camulodunum, Vernulamium, and Londinium were destroyed. In the east a major military effort under Corbulo, Rome’s foremost general, was required (62–65) to reestablish Roman prestige; a compromise settlement was reached, with the Romans accepting the Parthian nominee in Armenia and the Parthians recognizing him as Rome’s client king. In 66, however, revolt flared in Judaea, fired by Roman cruelty and stupidity, Jewish fanaticism, and communal hatreds; the prefect of Egypt, Julius Alexander, prevented involvement of the Jews of the Diaspora. An army was sent to Judaea under Titus Flavius Vespasianus to restore order; but it had not completed its task when two provincial governors in the west rebelled against Nero—Julius Vindex in Gallia Lugdunensis and Sulpicius Galba in Hispania Tarraconensis. When the praetorians in Rome also renounced their allegiance, Nero lost his nerve and committed suicide. He brought the Julio-Claudian dynasty to an ignominious end by being the first emperor to suffer damnatio memoriae—his reign was officially stricken from the record by order of the Senate. Growth of the empire under the Flavians and Antonines The year of the four emperors
Nero’s death ushered in the so-called year of the four emperors. The extinction of the Julio-Claudian imperial house robbed the soldiers of a focus for their allegiance, and civil war between the different armies ensued. The army of Upper Germany, after crushing Vindex, urged its commander, Verginius Rufus, to seize the purple for himself. But he elected to support Galba—scion of a republican patrician family claiming descent from Jupiter and Pasiphae—who was recognized as emperor by the Senate. However, the treasury, emptied by Nero’s extravagance, imposed a stringent economy, and this bred unpopularity for Galba; his age (73) was also against him, and unrest grew. Early in January 69 the Rhineland armies acclaimed Aulus Vitellius, commander in Lower Germany; at Rome the praetorians preferred Marcus Salvius Otho, whom Galba had alienated by choosing a descendant of the old republican aristocracy for his successor. Otho promptly procured Galba’s murder and obtained senatorial recognition; this ended the monopoly of the purple for the republican nobility.
Otho, however, lasted only three months; defeated at Bedriacum, near Cremona in northern Italy, by Vitellius’ powerful Rhineland army, he committed suicide (April 69). The Senate thereupon recognized Vitellius; but the soldiers along the Danube and in the east supported Vespasianus, the commander in Judaea. In a second battle near Bedriacum, the Rhineland troops were defeated in their turn, and on Vitellius’ death soon afterward an accommodating Senate pronounced Vespasian emperor. The Flavian emperors