The sixth and final ruler of the Julio-Claudian dynasty, Nero was the grand-nephew of his predecessor, the Emperor Claudius and the nephew of Caligula, Claudius’ predecessor. He would become legendary for his cruelty, although most of the accounts attesting to it are from contemporaries who disliked him, and may have been exaggerated. Nero was only 17 when he ascended to the throne – it was only because both these Emperors died without issue that he even got that close to power. If either of the two had had a son, Nero would today be a footnote.
Instead, he would reign for 13 years, being the Emperor during the great fire of Rome in 64 CE (history records that Nero was instrumental in the rebuilding of Rome afterwards – the business about the fiddling seems to have been a rumour spread by his political enemies), and the famed revolts of Britannia (led by Boudicca) and Judea (which ended in the destruction of the Temple in Jerusalem, and the beginnings of the Jewish Diaspora). Upon his death in 68 CE, (also without issue,) Nero threw the Empire into the chaos and civil war of what became known as the Year of the Four Emperors.
Looking at the history of the last three Julio-Claudian Emperors, one can only conclude that for a people so infamous for their orgies, the Romans must have known a thing or two about birth control.