WordNet (r) 3.0 (2006):

Claudius I
    n 1: Roman Emperor after his nephew Caligula was murdered;
         consolidated the Roman Empire and conquered southern
         Britain; was poisoned by his fourth wife Agrippina after
         her son Nero was named as Claudius' heir (10 BC to AD 54)
         [syn: Claudius, Claudius I, Tiberius Claudius Drusus
         Nero Germanicus]