Britannicus was the son of the emperor Claudius and Messalina and was originally expected to inherit the principate. After Claudius married Agrippina the Younger, Nero was adopted, married Britannicus’s sister Octavia and took precedence in the succession.
Britannicus was only thirteen or fourteen when he died suddenly at a banquet in AD 55. Ancient authors claim that Nero had him poisoned, although the precise circumstances cannot be proved. Britannicus was born in Rome.
Margaret George’s The Confessions of Young Nero presents Britannicus as the natural son of Claudius whose place in the succession is displaced when Agrippina advances Nero through marriage, adoption and court influence. Simon Scarrow’s Day of the Caesars begins after Claudius’s death, when supporters of Britannicus still make the younger prince a possible focus for resistance to Nero’s accession. Conn Iggulden’s Tyrant uses the same rivalry to show how dangerous proximity to the imperial household becomes for soldiers and courtiers who cannot know which heir will survive. Robert Graves’s Claudius the God places Britannicus inside Claudius’s increasingly troubled family government, where the emperor’s marriage to Agrippina and adoption of Nero alter the future expected for his own son.