1) Claudius was an unlikely emperor, disfigured and clumsy, but became emperor after Caligula's murder in 41 AD.
2) As emperor, Claudius surprisingly proved popular and successful, improving Rome's legal system, extending citizenship, and conquering Britain.
3) However, Claudius' poor choice in wives, namely the unfaithful Messalina and ambitious Agrippina, would lead to his downfall, with Agrippina poisoning Claudius so that her son Nero could become emperor.