The deceiver abideth at the feet of the deceived

The proverb The deceiver abideth at the feet of the deceived names a reversal in which the victim of a fraud ultimately holds the deceiver at their mercy. Filomena introduces it not as an abstract maxim but as a claim to be tested against events: her story of Ginevra, Bernabo Lomellini, and Ambrogiuolo of Piacenza turns a wager about a wife’s fidelity into a demonstration of how a deceiver’s apparent victory can become the means of his exposure and punishment.

Meaning and Narrative Use

Filomena explains that the proverb is often repeated among ordinary people, but insists that its truth should be shown through actual occurrences. The expression therefore works both as a warning to hearers, who may learn to guard against deceivers, and as a promise about the shape of the story: fraud will not be judged only by the deceiver’s early success. Its image of someone lying at another’s feet makes the reversal one of power and dependence, not merely a discovery that a lie has been told.

The phrase also establishes a tension between what seems proven and what is true. Ambrogiuolo presents details and objects as evidence against Ginevra, and Bernabo accepts the appearance of proof. The story’s governing question is not simply whether the evidence persuades, but who has the knowledge and authority to determine what it means. Filomena’s framing asks the audience to hold judgment open until the consequences of the deception become visible.

The Wager and the False Proof

The episode begins with Italian merchants supping together in Paris and debating whether their wives remain faithful while their husbands are away. Bernabo praises Ginevra as exceptionally accomplished, wise, and chaste, while Ambrogiuolo of Piacenza mocks his confidence and challenges the claim. Their wager makes Ginevra’s private virtue the subject of a public contest between men, although she has no part in setting its terms.

To manufacture proof, Ambrogiuolo arranges for a woman associated with Ginevra’s household to bring him, hidden in a chest, into her bedchamber. He observes the room and its furnishings, sees Ginevra asleep beside a little girl, and notices a distinctive mole beneath her left breast, ringed with small red-gold hairs. He takes a purse, a night-rail, rings, and girdles from a coffer, then carries these details and possessions back to Paris. The intrusion gives him genuine knowledge and stolen objects, but not the intimacy he claims to have had with Ginevra.

Before the assembled merchants, Ambrogiuolo describes the chamber and produces the belongings. Bernabo recognizes them but resists accepting them as conclusive: servants might have supplied the information or obtained the objects. Ambrogiuolo then names the hidden mark on Ginevra’s body. Bernabo’s changed expression betrays that the detail is true, and he yields the wager. The private fact that should have been inaccessible becomes the false proof that persuades him, turning deception into an immediate threat to Ginevra’s life.

Reversal and the Proverb’s Fulfillment

Bernabo leaves Paris and returns toward Genoa with murderous intent. Rather than enter the city, he stops at a country house and sends a trusted servant to summon Ginevra, privately instructing him in what to do. The story’s opening thus makes the cost of Ambrogiuolo’s fraud concrete: Bernabo acts on a false conclusion, and Ginevra must face the danger created by evidence that appears authentic.

The tale’s framing supplies the eventual reversal. Ginevra escapes, serves the ruler of Alexandria in men’s clothing, encounters the man who deceived her husband, and brings Bernabo to Alexandria. Ambrogiuolo is punished; Ginevra resumes women’s apparel and returns to Genoa with her husband, rich. The saying’s promised change of power is thereby enacted: the woman made the object of a wager becomes the agent who brings the deceiver and the deceived together, while the man who seemed to control the evidence loses control of what follows.

Other Stories and the Limits of the Maxim

The collection does not make every deception resolve in the same way. In the story of Ser Ciappelletto, a notorious wrongdoer gives a holy friar a false confession and is afterward reputed a saint. The prologue distinguishes human judgment from divine judgment, suggesting that people may be deceived about a supposed intercessor even as God hears the sincere petitioner. Beside Filomena’s proverb, this episode makes the gap between public reputation and moral reality especially sharp: a fraud may be exposed and punished, or its falsehood may instead acquire the appearance of holiness.

Other episodes likewise vary the pattern. Abraham visits Rome, sees churchmen’s greed, gluttony, and sexual misconduct, and concludes that the continued growth of Christianity despite its leaders’ behavior is evidence of its divine support. In the story of Ferondo, an abbot’s deception makes a living man believe he has died and suffered in purgatory; when Ferondo returns, he recounts invented revelations, and his wife gives birth to a boy whom he believes to be his own. Fra Alberto’s impersonation of the Angel Gabriel, by contrast, is publicly exposed: the crowd recognizes him, abuses him, and the friars carry him back to his convent, where he is believed to have died in prison. These different outcomes keep the proverb from becoming a simple rule that every lie is promptly undone. Its force lies instead in the collection’s sustained attention to who controls a story, what counts as proof, and whether apparent authority survives the revelation of what has been concealed.