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Early life

Nero was born Lucius Domitius Ahenobarbus on 15 December AD 37 in Antium (modern Anzio), eight months after the death of Tiberius. He was an only-child, the son of the politician Gnaeus Domitius Ahenobarbus and Agrippina the Younger. His mother Agrippina was the sister of the third Roman emperor Caligula. Nero was also the great-great-grandson of former emperor Augustus (descended from Augustus' only daughter, Julia).

The ancient biographer Suetonius, who was critical of Nero's ancestors, wrote that emperor Augustus had reproached Nero's grandfather for his unseemly enjoyment of violent gladiator games. According to Jürgen Malitz, Suetonius tells that Nero's father was known to be "irascible and brutal", and that both "enjoyed chariot races and theater performances to a degree not befitting their position". Suetonius also mentions that when Nero's father Domitius was congratulated by his friends for the birth of his son, he replied that any child born to him and Agrippina would have a detestable nature and become a public danger.

Domitius died in AD 41. A few years before his father's death, his father was involved in a serious political scandal. His mother and his two surviving sisters, Agrippina and Julia Livilla, were exiled to a remote island in the Mediterranean Sea. His mother was said to have been exiled for plotting to overthrow the emperor Caligula. Nero's inheritance was taken from him, and he was sent to live with his paternal aunt Domitia Lepida, the mother of later emperor Claudius 's third wife, Messalina.

After Caligula's death, Claudius became the new emperor. Nero's mother married Claudius in AD 49, becoming his fourth wife. On 25 February AD 50, Claudius was pressured to adopt Nero as his son, giving him the new name of "Nero Claudius Caesar Drusus Germanicus". Claudius had gold coins issued to mark the adoption. Classics professor Josiah Osgood has written that "the coins, through their distribution and imagery alike, showed that a new Leader was in the making." However, David Shotter noted that, despite events in Rome, Nero's step-brother Britannicus was more prominent in provincial coinages during the early 50s.

Nero formally entered public life as an adult in AD 51 while 13 years old. When he turned 16, Nero married Claudius' daughter (his step-sister), Claudia Octavia. Between the years AD 51 and AD 53, he gave several speeches on behalf of various communities, including the Ilians; the Apameans (requesting a five-year tax reprieve after an earthquake); and the northern colony of Bologna, after their settlement had suffered a devastating fire.

Claudius died in AD 54; many ancient historians claim that he was poisoned by Agrippina. Shotter has written that "Claudius' death...has usually been regarded as an event hastened by Agrippina, due to signs that Claudius was showing a renewed affection for his natural son." He notes that among ancient sources, the Roman historian Josephus was uniquely reserved in describing the poisoning as a rumor. Contemporary sources differ in their accounts of the poisoning. Tacitus says that the poison-maker Locusta prepared the toxin, which was served to the Emperor by his servant Halotus. Tacitus also writes that Agrippina arranged for Claudius' doctor Xenophon to administer poison, in the event that the Emperor survived. Suetonius differs in some details, but also implicates Halotus and Agrippina. Like Tacitus, Cassius Dio writes that the poison was prepared by Locusta, but in Dio's account it is administered by Agrippina instead of Halotus. In Apocolocyntosis, Seneca the Younger does not mention mushrooms at all. Agrippina's involvement in Claudius' death is not accepted by all modern scholars.

Before Claudius' death, Agrippina had maneuvered to remove Claudius' sons' tutors in order to replace them with tutors that she had selected. She was also able to convince Claudius to replace two prefects of the Praetorian Guard (who were suspected of supporting Claudius' son) with Afranius Burrus (Nero's future guide). Since Agrippina had replaced the guard officers with men loyal to her, Nero was subsequently able to assume power without incident.