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Adopted grandson and heir of the Roman emperor Tiberius

Nero Julius Caesar (c. AD 6–31) was the adopted grandson and heir of the Roman Emperor Tiberius, alongside his brother Drusus. Born into the prominent Julio Claudian dynasty, Nero was the son of Tiberius' general and heir, Germanicus. After the deaths of his father and of Tiberius' son, Drusus the Younger, Nero and his brother Drusus were adopted together by Tiberius in September AD 23. As a result of being heirs of the emperor, he and his brother enjoyed accelerated political careers. Sejanus, prefect of the Praetorian Guard, had become powerful in Rome and is believed by ancient writers such as Suetonius and Tacitus to have been responsible for the downfall of Drusus the Younger. As the power of Sejanus grew, other members of the imperial family began to fall as well. In AD 29, Tiberius wrote a letter to the Senate attacking Nero and his mother, and the Senate had them both exiled. Two years later, he died in exile on the island of Ponza. His brother Drusus also died in exile in AD 33. Their deaths allowed for the adoption and ascension of their younger brother, Caligula, following the death of Tiberius in AD 37.

Nero was born around AD 6 to Germanicus and Agrippina the Elder. Nero's paternal grandparents were Nero Claudius Drusus (Drusus the Elder) and Antonia Minor, daughter of Mark Antony and Octavia Minor. His maternal grandparents were Marcus Vipsanius Agrippa, a close friend of Augustus, and Augustus' daughter Julia the Elder. Nero had eight siblings: four brothers (Tiberius and Gaius Julius, who died young; Drusus Caesar; and Gaius, nicknamed "Caligula") , three sisters (Agrippina the Younger, Julia Drusilla, and Julia Livilla) and a brother or sister of unknown name (normally referenced as Ignotus). As a member of the Julio Claudian dynasty, he was a close relative of all five Julio Claudian emperors: his great grandfather Augustus was the first emperor of the dynasty, his great uncle Tiberius was the second emperor, his brother Gaius (Caligula) was the third emperor, his uncle Claudius was the fourth emperor, and his nephew Lucius Domitius (Nero) was the fifth and final emperor of the dynasty. In AD 13 Nero's father was appointed commander of the forces on the Rhine, from where he led three campaigns into Germania against the forces of Arminius. His victories against the German tribes which had made him popular as he avenged the Roman defeat at the Battle of Teutoburg Forest. In October AD 14, Germanicus received a delegation from the Senate giving their condolences for the death of Augustus. Augustus had died in August and Tiberius became emperor, making Germanicus heir to the empire. At the direction of Tiberius, Germanicus was dispatched to Asia to reorganize the provinces and assert imperial authority there. However, after two years in the east, Germanicus came into conflict with the governor of Syria, Gnaeus Calpurnius Piso. During their feud, Germanicus fell ill and died in October AD 19. While Nero's father was alive he had been betrothed to the daughter of Creticus Silanus, the one time governor of Syria. However, in AD 20, Nero married Julia, daughter of Livilla and Drusus the Younger (Tiberius' only son by Vipsania Agrippina).

Nero's mother Agrippina believed her husband was murdered to promote Drusus the Younger as heir, and feared that the birth of his twin sons would give him a motive to displace her own sons. However, her fears were unfounded, with Nero being elevated by Tiberius. On 7 June AD 20, Nero was brought into the forum to receive the toga virilis, introduced into the Senate by Tiberius and Drusus the Younger, and was promised the office of quaestor in five years' time. He was excused from holding the lowest magistracy, the vigintivirate, and a congiaria of 60 denarii was distributed by Tiberius at his tirocinium. He was wed to Drusus the Younger's daughter, Julia, later that year combining the families of both possible lines of succession (that of Germanicus and Drusus the Younger). His brother Drusus was introduced to the Senate with similar honours in AD 23, and he too was promised the rank of quaestor in five years' time.

Following the death of Germanicus, Drusus the Younger was Tiberius' new heir. He received a second consulship in AD 21 and tribunicia potestas (tribunician power) in AD 22. At the same time, Praetorian Prefect Sejanus started to exert considerable influence over the emperor, who referred to Sejanus as Socius Laborum ("my partner in my toils"). Around AD 20, when Sejanus became the first of the equestrian order to hold the praetorship, a senatorial office, his daughter Aelia Junilla was born and swiftly betrothed to Nero's cousin, the boy Claudius Drusus, firstborn son of the future emperor Claudius. At the prospect of a familial bond between the Claudia gens and Sejanus's family, Drusus the Younger is reported by Tacitus to have said of Sejanus in disgust "the grandsons of us Drususes will be his grandsons too". (communis tili cum familia Drusorum fore nepotes.) Claudius Drusus also died before reaching adulthood. The death of the Younger Drusus left no immediate threat to Sejanus. Ultimately, his death elevated Nero and his brother Drusus to the position of heirs. In effect, this led to the formation of factions, with one faction around Nero and Drusus and their mother Agrippina and the other faction linked to Sejanus. While the full extent of Sejanus' power at this point is uncertain, it can be noted that Sejanus was not allowed to marry Livilla (Drusus the Younger's widow) and was thus denied entry into the imperial family. In the Senate, Sejanus encountered little opposition from the senators, but Tiberius expressed displeasure in the Senate, in AD 24, at the public prayers which had been offered for Nero and his brother Drusus' health. In AD 28, the Senate voted that altars to Clementia (mercy) and Amicitia (friendship) be raised. At that time, Clementia was considered a virtue of the ruling class, for only the powerful could give clemency. The altar of Amicitia was flanked by statues of Sejanus and Tiberius. By this time, Sejanus' association with Tiberius had reached the point where members of Roman society would make prayers and sacrifices and erect statues in his honour. Sejanus' birthday was honoured as if he were a member of the imperial family. According to the author and historian Richard Alston, "Sejanus' association with Tiberius must have at least indicated to the people that he would be further elevated". Agrippina was popular with the people, as was the family of Germanicus, and the people surrounded the senate house carrying likenesses of the two in protest against Tiberius. The Senate refused to come to a resolution on the matter until it received a clear direction from the emperor to do so. Tiberius found it necessary to repeat his charges, and when he did, the Senate no longer delayed; the fate of Agrippina and Nero was sealed. Nero was declared an enemy of the state, removed to the island of Pontia, and was killed or encouraged to kill himself in AD 31. According to Suetonius, he put an end to his own life when the executioner appeared before him with the instruments of death.

Rose, Charles Brian, Dynastic Commemoration and Imperial Portraiture in the Julio Claudian Period. Cambridge, 1997, nr. 17, pp. 66–67.