Prato is the setting of Madam Filippa’s trial, where a law prescribing death for wives found in adultery is publicly challenged and changed. The city matters not merely as a backdrop: its statute, court, and assembled crowd turn one woman’s prosecution into a contest over how the law defines and punishes female sexuality.

The City and Its Statute

The story places Prato under an ordinance that treats two different acts as equivalent: a wife’s adultery and a woman’s sale of sexual favors for money. Either, if discovered by a husband, could bring the death penalty. The law makes the distinction between consensual desire and paid sex disappear, while assigning the punishment to women and the power to initiate proceedings to their husbands.

That rule gives the city’s court its immediate stakes. Rinaldo de' Pugliesi finds his wife, Madam Filippa, with her lover, Lazzerino de' Guazzagliotri, in her chamber. Though angered enough to contemplate killing them himself, he fears the consequences and instead seeks the death he cannot personally inflict through the law of Prato. The ordinance converts a domestic discovery into a public criminal accusation.

The Trial in Prato

When morning comes, Rinaldo brings a case supported by what the story describes as sufficient evidence. Madam Filippa’s friends and relatives urge her to deny the charge, but she appears before the provost rather than flee into exile. A large company of men and women accompanies her. The magistrate explains that the statute requires her confession before he can condemn her, and warns her to consider her answer carefully.

Filippa does not dispute the adultery. Instead, she asks the provost to establish whether she has always granted her husband what he wanted from her. Rinaldo answers that she has. She then argues that, if her husband’s needs have been met, what remained need not be wasted: she chose to give it to a gentleman who loved her. Her reply turns the hearing away from concealment and toward the statute’s assumptions about a husband’s claims and a wife’s remaining desires.

The Crowd and the Change in Law

The people of Prato have gathered to watch the case against a beautiful and well-known woman. Her argument makes them laugh, and their response becomes part of the outcome: they cry out together that she is right and has spoken well. At the provost’s prompting, the law is modified before the crowd disperses. It henceforth applies only to women who commit adultery for money, rather than to every wife found with a lover.

Rinaldo leaves the court with shame instead of the punishment he sought. Filippa returns home free and triumphant, described as though she had been lifted from the fire. The change does not abolish the statute’s unequal treatment of women, but it narrows its reach through a public hearing in which the accused woman speaks, the crowd judges her reasoning, and the court gives that judgment legal force.

Prato’s Narrative Significance

The episode makes Prato a place where a private relationship becomes a question of civic justice. The courtroom concentrates the pressures surrounding women’s desire, reputation, and dependence on male authority into a single public scene: Rinaldo initiates the prosecution, the provost administers the statute, and Filippa answers before an audience capable of shifting the proceedings. Her wit does not merely save her from execution; it exposes the cruelty of treating adultery and paid sex as the same offense.

The setting also sharpens the story’s contrast between confinement and public voice. In the work’s broader account of women’s circumstances, women in love are described as constrained by family wishes and largely confined to their chambers, while men have more means of leaving home and diverting their thoughts. In Prato, Filippa steps into the civic space of the court and speaks for herself. The resulting reform is limited, but the city’s law is no longer quite what it was when her husband brought his accusation.