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The plot of Cymbeline is loosely based on a tale by Geoffrey of Monmouth about the real-life British monarch Cunobelinus. Shakespeare, however, freely adapts the legend to a large extent and adds entirely original sub-plots. Iachimo's wager and subsequent hiding-place within a chest in order to gather details of Imogen's room derive from story II.9 of Giovanni Boccaccio's Decameron.^[2]