. "Britannicus"@en . . "Tiberius Claudius Caesar Britannicus;"@en . . "Tiberius Claudius Caesar Britannicus (12 February AD 41 \u2014 11 February AD 55) was the son of the Roman emperor Claudius and his third wife Valeria Messalina. He became the heir-designate of the empire at his birth, less than a month into his father's reign. He was still a young boy at the time of his mother's downfall and Claudius' marriage to Agrippina the Younger. This allowed Agrippina's older son Nero to eclipse him in the public's mind."@en . . . . . "initially Tiberius Claudius Germanicus"@en . .