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The Mouth of Truth (Italian: Bocca della Verità [ˈbokka della veriˈta]) is an ancient Roman marble mask in Rome, Italy, which stands against the left wall of the portico of the Santa Maria in Cosmedin church, at the Piazza della Bocca della Verità, the site of the ancient Forum Boarium (the ancient cattle market). According to enduring medieval legend, it will bite off the hand of any liar who places their hand in its mouth, or, alternatively, any who utters a lie while their hand is in the mouth. It still attracts many visitors who insert their hands.