Gnaeus Domitius Ahenobarbus (father of Nero)

Domitius' birthdate is uncertain; some interpretations are that he was born around 17 BC[2] while other sources argue he was born a generation later in 2 BC. Domitius was the son of Antonia Major, the niece of emperor Augustus, and her husband Lucius Domitius Ahenobarbus. He had at least two sisters Domitia and Domitia Lepida, and possibly an older brother named Lucius Domitius Ahenobarbus, whom ancient sources confuse his early career and birthdate with.[3]

Describing him as "a man loathsome in every respect",[4] Suetonius says that as a young man, Domitius was serving on the staff of his second cousin Gaius Caesar in the east, in AD 2. Domitius killed his freedman for refusing to drink as much as he was told.[5] The reported reason was that the freedman did not get as drunk as Domitius did. On the Appian Way, Domitius was reported to have deliberately run over a child who was playing with his doll. At the Roman Forum, Domitius reportedly pulled out an eye of an equestrian because the equestrian openly criticized him. Although some historians such as Ronald Syme have argued that the Domitius who served with Gaius Caesar may have been an older brother of his and not Nero's father.[6] Gaius Stern claims that the Eastern expedition is actually that of Germanicus in AD 17–19, if one assumes his birth to be in 2 BC and still interpret the violent actions to belong to Nero's father.[7]

Domitius cheated on bankers for purchases he made. When he was praetor, Domitius would swindle the prize money of victorious charioteers. Managers would complain, but Domitius decreed that future prizes would be paid on the spot. Domitius was also considered a serious womanizer. The emperor Tiberius charged him with treason, adultery and incest with his sister and also with adultery with another noblewoman, but the ascension of Caligula saved him.

Domitius married his first cousin once removed Agrippina the Younger, Caligula's sister, after her thirteenth birthday in AD 28.[8] He was far older than her at the time. Tiberius arranged and ordered the marriage, which was celebrated in Rome. Domitius was wealthy, but apparently he and Agrippina chose to live between Antium and Rome.

Gnaeus Domitius from Guillaume Rouillé's Promptuarium Iconum Insigniorum

Domitius was consul in AD 32 and appointed by Tiberius as a commissioner in early AD 37. His son Lucius Domitius Ahenobarbus, later emperor Nero, was born on 15 December AD 37 in Antium. According to Suetonius, when 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, a fact that became true during the second part of Nero's reign. When Nero castrated a boy named Sporus and married him as a wife, Suetonius quoted one Roman who lived around this time who remarked that the world would have been better off if Nero's father had married someone more like the castrated boy.[9]

He died of edema at Pyrgi (an ancient Etruscan city) in January AD 41. In Domitius' will, Nero inherited one third of his estate, but Caligula, who was also mentioned in the will, took Nero's inheritance for himself. When Claudius became emperor, Nero's inheritance was restored.[10][11][12][13]