Julio-Claudian dynasty

• 1. Introduction

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  The Julio-Claudian dynasty supplied the first five emperors of Rome, and not one of them was the blood son of the man he replaced. Augustus, Tiberius, Caligula, Claudius, and Nero ruled in turn, yet the line moved sideways and backward through nephews and stepsons rather than straight from father to heir. The empire itself began in 27 BC, when Augustus took power. It would carry his family for almost a century, until AD 68. The name Julio-Claudian is a label invented by later historians. It joins two Roman family names, the Julii Caesares and the Claudii Nerones, into a single house that never officially called itself a royal family. How did a dynasty so obsessed with succession produce no normal succession at all? Why did emperors keep reaching past their own children to adopt great-nephews? And what kind of household passes power by murder, exile, and the careful rewriting of a name?

• 2. The Adopted Heir

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  Primogeniture is notably absent from this dynasty, and that absence shaped everything. Augustus, Caligula, and Nero all failed to father a legitimate biological son. Tiberius outlived his own son Drusus. Only Claudius was survived by a son, Britannicus, and even Claudius chose to push his adopted son Nero ahead instead.

  Adoption filled the gap that biology left. A Roman aristocrat could adopt an heir during his life or in his will if he lacked a natural son, and the adopted son would drop his original family name for that of his new family. Julius Caesar used this custom on his great-nephew Gaius Octavius, the man who became Augustus. Augustus then adopted his stepson Tiberius. Tiberius in turn was required to adopt his nephew Germanicus, the father of Caligula and brother of Claudius.

  Augustus, as Caesar's adopted son, threw away his natural father's family name and called himself Gaius Julius Caesar. Custom suggested he add a name acknowledging his birth family, which would have made him Gaius Julius Caesar Octavianus. There is no evidence he ever used the name Octavianus. The chain of adoptions ran to its very end with Nero, who had neither a natural nor an adopted son, and whose fall closed the line.

• 3. Blood, Marriage, And Name

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  Caligula was the first true Julio-Claudian, born into both the Julian and the Claudian branches at once. His father Germanicus was the son of Nero Claudius Drusus and Antonia Minor, who themselves descended from Livia and from Octavia Minor. His wife Agrippina the Elder was a granddaughter of Augustus, which made Germanicus' children, Caligula among them, great-grandchildren of Augustus.

  Tiberius reached the Julian side only by marriage and adoption. A Claudian by birth, he became Augustus' stepson when Augustus married Livia, who divorced Tiberius' own father to do so. Tiberius then married Augustus' only daughter, Julia the Elder, tying himself tighter to the Julian line before succeeding Augustus in AD 14.

  Claudius stands apart as the one emperor never adopted into the Julian family. He was a Claudian through his father Nero Claudius Drusus, the younger brother of Tiberius, and a great-nephew of Augustus through his mother Antonia Minor. When he became emperor he simply added the Julian-affiliated cognomen Caesar to his name. Nero arrived from a third family entirely. Born into the Domitii Ahenobarbi on his father's side, he became a Claudian in name only when his mother Agrippina the Younger married her uncle Claudius, who adopted him.

• 4. Augustus And The Vanishing Heirs

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  Lacking a male child, Augustus married his only daughter Julia to his nephew Marcus Claudius Marcellus, who died of food poisoning in 23 BC. He then married the widowed Julia to his loyal friend Marcus Vipsanius Agrippa. That match produced five children: Gaius Caesar, Lucius Caesar, Julia the Younger, Agrippina the Elder, and Agrippa Postumus.

  Gaius and Lucius were adopted by Augustus and made heirs, yet death dismantled the plan piece by piece. Agrippa died in 12 BC. Drusus, the brother of Tiberius, died in 9 BC after falling from a horse. Tiberius, ordered to divorce Vipsania Agrippina and marry Julia, went into voluntary exile on Rhodes in 6 BC. Lucius died in AD 2 and Gaius in AD 4.

  Scandal finished what death began. Both Julias were exiled for adultery, Iullus Antonius committed suicide, and Lucius Aemilius Paullus was executed for conspiracy. Augustus banished his adopted grandson Postumus Agrippa to the small island of Planasia around AD 6 or 7, where he was later executed. Out of options, Augustus recalled Tiberius, adopted him, and required him to adopt the young Germanicus.

• 5. Tiberius And The Spymaster

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  On the 19th of August AD 14, Augustus died, and Tiberius, already Princeps in all but name, was confirmed as heir in the will. His first years went generally well, and he honored Augustus' wishes by favoring his adopted son Germanicus over his own son Drusus. Germanicus took command in Germania and led the legions on campaigns against Germanic tribes from AD 14 to 16.

  Germanicus died in Syria in AD 19. On his deathbed he accused the governor of Syria, Gnaeus Calpurnius Piso, of murdering him on Tiberius' orders. With Germanicus gone, Tiberius began raising his own son Drusus toward the succession, while handing more daily rule to Lucius Aelius Sejanus.

  Sejanus built an atmosphere of fear in Rome through a network of informers and spies, who were rewarded with a share of a convicted man's property. Treason trials became commonplace, and few aristocrats were safe. By AD 31 Sejanus held the consulship with the emperor himself as colleague, an honor reserved for heirs. Summoned to the Senate on the 18th of October AD 31 expecting tribunician power, he instead heard Tiberius' letter demand his destruction. A purge killed Sejanus and his closest supporters. Suetonius records a darker private legend, of cruelty and forced orgies on the island of Capri. Rome's second emperor died at Misenum on the 16th of March AD 37, aged 78, after a reign of 23 years, smothered with a pillow, Suetonius writes, by the Praetorian Prefect Naevius Sutorius Macro.

• 6. Caligula's Brief Terror

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  Tiberius' will named two joint heirs, Caligula and his cousin Tiberius Gemellus, but Caligula ordered Gemellus killed within his first year. Backed by Naevius Sutorius Macro, he made himself sole princeps, then had Macro disposed of as well. He ruled from AD 37 to 41, the third Roman emperor, remembered by his childhood nickname.

  Family offered no protection. Caligula named his brother-in-law Marcus Aemilius Lepidus, husband of his sister Julia Drusilla, as heir, then executed him after Drusilla's death over alleged affairs with the emperor's other sisters. He had earlier killed Drusilla's first husband Lucius Cassius Longinus, and seized the inheritance of Gnaeus Domitius Ahenobarbus.

  Several assassination attempts failed before one succeeded. The conspiracy grew out of the disgruntled Praetorian Guard with Senate backing. Josephus claims the plotters wanted the Republic restored, while Suetonius judged their motives mostly personal. On the 24th of January AD 41, the Praetorian tribune Cassius Chaerea and his men stopped Caligula alone in an underground passage leading to a theatre and stabbed him to death. With the tribune Cornelius Sabinus, Chaerea killed Caligula's wife Caesonia and their infant daughter Julia Drusilla the same day.

• 7. Claudius The Reluctant Builder

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  After Caligula fell, the Senate tried and failed to restore the Republic, and the Praetorian Guards installed Claudius, the dead emperor's paternal uncle. Despite his lack of political experience and the disapproval of Rome's people, he proved an able administrator and a great builder of public works. His reign expanded the empire, including the invasion of Britain in AD 43. He took a personal interest in the law, presided at trials, and issued up to twenty edicts a day.

  The nobility never trusted him, and his rule cost many senators their lives. His personal life brought tragedy too. He married four times, in order to Plautia Urgulanilla, Aelia Paetina, Valeria Messalina, and finally Agrippina the Younger, his own niece. Suetonius describes him as easily manipulated. Messalina engineered the deaths of several relatives before she herself was executed on a charge of adultery.

  To gain political support, Claudius married Agrippina and adopted her son Nero on the 25th of February AD 50, placing him ahead of his own son Britannicus. Claudius died on the 13th of October AD 54. Several ancient historians accuse Agrippina of poisoning him, though accounts vary widely. These events survive in book 12 of Tacitus' Annals, book 61 of Cassius Dio's Roman History, and the biographies by Suetonius.

• 8. Nero And The End Of The Line

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  Nero became emperor in AD 54 at sixteen, the youngest yet, and as a direct descendant of Augustus his accession was smoother than that of Tiberius or Claudius. Ancient historians describe an early reign shaped by his mother Agrippina the Younger, his tutor Seneca, and the Praetorian Prefect Burrus. In his first year he left the daily running of the empire to Agrippina, and he had his step-brother Britannicus killed. From AD 55 he took a more active role, holding the consulship four times between AD 55 and 60, executing or banishing rivals and drawing power away from the Senate.

  The killings reached his own household. He arranged the death of his mother, and after divorcing his wife Claudia Octavia, daughter of Claudius and Messalina, he had her killed too. In AD 64 Rome burned, and Nero answered with public relief and large reconstruction projects, funding them by heavily taxing the provinces.

  By AD 65 senators complained they had no power left, and the Pisonian conspiracy formed under Gaius Calpurnius Piso. It failed, and its members were executed. In late AD 67 or early 68, Vindex, governor of Gallia Lugdunensis, rebelled against Nero's tax policies and called on Galba, governor of Hispania Citerior, to become emperor. Lucius Virginius Rufus defeated Vindex, who committed suicide, yet Nymphidius Sabinus bribed the Praetorian Guard to betray Nero. Nero killed himself with the help of his scribe Epaphroditus. With his death the dynasty ended, and chaos followed in the Year of the Four Emperors. Yet Augustus' bloodline survived through his granddaughter Julia the Younger, reaching as far as the Severan era and the family of the emperor Domitian's wife, Domitia Longina.