and relieved at this news, Cymbeline prepares to execute his new prisoners, but pauses when he sees Fidele, whom he finds both beautiful and somehow familiar. Fidele has noticed Posthumus's ring on Iachimo's finger and abruptly demands to know from where the jewel came. A remorseful Iachimo tells of his bet, and how he could not seduce Imogen, yet tricked Posthumus into thinking he had. Posthumus then comes forward to confirm Iachimo's story, revealing his identity and acknowledging his wrongfulness in desiring Imogen killed. Ecstatic, Imogen throws herself at Posthumus, who still takes her for a boy and knocks her down. Pisanio then rushes forward to explain that Fidele is Imogen in disguise; Imogen still suspects that Pisanio conspired with the Queen to give her the poison. Pisanio sincerely claims innocence, and Cornelius reveals how the poison was a non-fatal potion all along. Insisting that his betrayal years ago was a set-up, Belarius makes his own happy confession, revealing Guiderius and Arviragus as Cymbeline's own two long-lost sons. With her brothers restored to their place in the line of inheritance, Imogen is now free to marry Posthumus. An elated Cymbeline pardons Belarius and the Roman prisoners, including Lucius and Iachimo. Lucius calls forth his soothsayer to decipher a prophecy of recent events, which ensures happiness for all. Blaming his manipulative Queen for his refusal to pay earlier, Cymbeline now agrees to pay the tribute to the Roman Emperor as a gesture of peace between Britain and Rome, and he invites everyone to a great feast. Sources Cymbeline is grounded in the story of the historical British king Cunobeline, which was originally recorded in Geoffrey of Monmouth's Historia Regum Britanniae, but which Shakespeare likely found in the 1587 edition of Raphael Holinshed's Chronicles. Shakespeare based the setting of the play and the character Cymbeline on what he found in Holinshed's chronicles, but the plot and subplots of the play are derived from other sources. The subplot of Posthumus and Iachimo's wager derives from story II.9 of Giovanni Boccaccio's The Decameron and the anonymously authored Frederyke of Jennen. These share similar characters and wager terms, and both feature Iachimo's equivalent hiding in a chest in order to gather proof in Imogen's room. Iachimo's description of Imogen's room as proof of her infidelity derives from The Decameron, and Pisanio's reluctance to kill Imogen and his use of her bloody clothes to convince Posthumus