Cymbeline, the King of Britain, is angry that his daughter Imogen has chosen a poor (but worthy) man for her husband. So he banishes Posthumus, who goes to fight for Rome. Imogen (dressed as a boy) goes in search of her husband, who meanwhile has boasted to his pal Iachimo that Imogen would never betray him. And Iachimo's determined to prove him wrong.
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