Caius Lucius is a noble Roman, an ambassador to the British court who is later given command of the invading Roman army.
He is deeply respected by all, including his enemies, and he deeply regrets the necessity of warring on Cymbeline when the latter refuses to pay tribute. He is a kind man and takes the boy Fidele for a page out of pity when he meets him, little dreaming that he is in fact Cymbeline’s daughter Imogen. Captured in battle, he refuses to consider the fortunes of the day as having marked one party as right or wrong, just as he refuses to beg for mercy. He is shocked and hurt that Fidele will not ask Cymbeline to save his life. His reaction to Cymbeline’s decision to pay the tribute to Rome despite having won the battle is not recorded.