Britannicus (Claudius Tiberius Germanicus Britannicus) brĭtăn´ĭkəs [key], AD 41?–AD 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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