Adoption in ancient Rome in the context of "List of Roman emperors"

Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian (Latin: Octavianus), was the founder of the Roman Empire, who reigned as the first Roman emperor from 27 BC until his death in AD 14. The reign of Augustus initiated an imperial cult and an era of imperial peace (the Pax Romana or Pax Augusta) in which the Roman world was largely free of armed conflict. The Principate system of government was established during his reign and lasted until the Crisis of the Third Century.

Octavian was born into an equestrian branch of the plebeian gens Octavia. Following the assassination of Julius Caesar in 44 BC, Octavian was named in Caesar's will as his adopted son and heir, and inherited Caesar's name, estate, and the loyalty of his legions. He, Mark Antony, and Marcus Lepidus formed the Second Triumvirate to defeat the assassins of Caesar. Following their victory at the Battle of Philippi (42 BC), the Triumvirate divided the Roman Republic among themselves and ruled as de facto oligarchs. The Triumvirate was eventually torn apart by the competing ambitions of its members; Lepidus was exiled in 36 BC, and Antony was defeated by Octavian's naval commander Marcus Agrippa at the Battle of Actium in 31 BC. Antony and his wife Cleopatra, the Ptolemaic queen of Egypt, killed themselves during Octavian's invasion of Egypt, which then became a Roman province.

Marcus Aurelius Antoninus (/ɔːˈriːliəs/ or-EE-lee-əs, Latin: [ˈmaːrkʊs au̯ˈreːli.us antoːˈniːnʊs]; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 and a Stoic philosopher. He was a member of the Nerva–Antonine dynasty, the last of the rulers later known as the Five Good Emperors and the last emperor of the Pax Romana, an age of relative peace, calm, and stability for the Roman Empire lasting from 27 BC to 180 AD. He served as Roman consul in 140, 145, and 161.

Marcus Aurelius was the son of the praetor Marcus Annius Verus and his wife, Domitia Calvilla. He was related through marriage to the emperors Trajan and Hadrian. Marcus was three when his father died, and was raised by his mother and paternal grandfather. After Hadrian's adoptive son, Aelius Caesar, died in 138, Hadrian adopted Marcus's uncle Antoninus Pius as his new heir. In turn, Antoninus adopted Marcus and Lucius, the son of Aelius. Hadrian died that year, and Antoninus became emperor. Now heir to the throne, Marcus studied Greek and Latin under tutors such as Herodes Atticus and Marcus Cornelius Fronto. He married Antoninus's daughter Faustina in 145.

Nerva (/ˈnɜːrvə/; born Marcus Cocceius Nerva; 8 November 30 – 27 January 98) was a Roman emperor from AD 96 to 98. Nerva became emperor when aged almost 66, after a lifetime of imperial service under Nero and the succeeding rulers of the Flavian dynasty. Under Nero, he was a member of the imperial entourage and played a vital part in exposing the Pisonian conspiracy of 65. Later, as a loyalist to the Flavians, he attained consulships in 71 and 90 during the reigns of Vespasian and Domitian, respectively. On 18 September 96, Domitian was assassinated in a palace conspiracy involving members of the Praetorian Guard and several of his freedmen. On the same day, Nerva was declared emperor by the Roman Senate. As the new ruler of the Roman Empire, he vowed to restore liberties which had been curtailed during the autocratic government of Domitian.

Nerva's brief reign was marred by financial difficulties and his inability to assert his authority over the Roman army. A revolt by the Praetorian Guard in October 97 essentially forced him to adopt an heir. After some deliberation Nerva adopted Trajan, a young and popular general, as his successor. After barely fifteen months in office, Nerva died of natural causes on 27 January 98. Upon his death he was succeeded and deified by Trajan. Although much of his life remains obscure, Nerva was considered a wise and moderate emperor by ancient historians. Nerva's greatest success was ensuring a peaceful transition of power after his death by selecting Trajan as his heir, thus founding the Nerva–Antonine dynasty. He was the first of the Five Good Emperors.

Lucius Aurelius Verus (/ˈvɪərəs/; 15 December 130 – 23 January 169) was Roman emperor from 161 until his death in 169, alongside his adoptive brother Marcus Aurelius. He was a member of the Nerva–Antonine dynasty. Verus' succession together with Marcus Aurelius marked the first time that the Roman Empire was ruled by more than one emperor simultaneously, an increasingly common occurrence in the later history of the Empire.

Born on 15 December 130, he was the eldest son of Lucius Aelius Caesar, first adopted son and heir to Hadrian. Raised and educated in Rome, he held several political offices prior to taking the throne. After his biological father's death in 138, he was adopted by Antoninus Pius, who was himself adopted by Hadrian. Hadrian died later that year, and Antoninus Pius succeeded to the throne. Antoninus Pius would rule the empire until 161, when he died, and was succeeded by Marcus Aurelius, who later raised his adoptive brother Verus to co-emperor.

Nero Claudius Caesar Augustus Germanicus (/ˈnɪəroʊ/ NEER-oh; born Lucius Domitius Ahenobarbus; 15 December AD 37 – 9 June AD 68) was a Roman emperor and the final emperor of the Julio-Claudian dynasty, reigning from AD 54 until his death in AD 68.

Nero was born at Antium in AD 37, the son of Gnaeus Domitius Ahenobarbus and Agrippina the Younger (great-granddaughter of the emperor Augustus). Nero was three when his father died. By the time Nero turned eleven, his mother married Emperor Claudius, who then adopted Nero as his heir. Upon Claudius' death in AD 54, Nero ascended to the throne with the backing of the Praetorian Guard and the Senate. In the early years of his reign, Nero was advised and guided by his mother Agrippina, his tutor Seneca the Younger, and his praetorian prefect Sextus Afranius Burrus, but sought to rule independently and rid himself of restraining influences. The power struggle between Nero and his mother reached its climax when he orchestrated her murder. Roman sources also implicate Nero in the deaths of both his wife Claudia Octavia – supposedly so he could marry Poppaea Sabina – and his stepbrother Britannicus.

Livia Drusilla (30 January 59 BC – AD 29) was Roman empress from 27 BC to AD 14 as the wife of Augustus, the first Roman emperor. She was known as Julia Augusta after her formal adoption into the Julia gens in AD 14.

Livia was the daughter of senator Marcus Livius Drusus Claudianus and his wife Alfidia. She married Tiberius Claudius Nero around 43 BC, and they had two sons, Tiberius and Drusus. In 38 BC, she divorced Tiberius Claudius Nero and married the political leader Octavian. The Senate granted Octavian the title Augustus in 27 BC, effectively making him emperor. In her role as Roman empress, Livia served as an influential confidant to her husband and was rumoured to have been responsible for the deaths of several of his relatives, including his grandson Agrippa Postumus.