Britannicus (Claudius Tiberius Germanicus Britannicus) brĭtănˈĭkəs [key], a.d. 41?–a.d. 55, Roman prince, son of Claudius I and Messalina, so called in honor of Claudius' conquests in Britain. After Claudius' marriage to Agrippina the Younger, mother of Nero, Britannicus was passed over as heir in favor of Nero. He was poisoned after Nero's accession. His death is the subject of Racine's drama Britannicus.

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