In 1637, Nicolas Poussin painted Saint Margaret at a turning point in his Roman career, just as his fame was spreading among French and Italian collectors alike. The subject was a rare one for Poussin, who more often depicted ancient myth or Old Testament drama; here, he tackled the legend of a Christian virgin-martyr. No fewer than three versions of Saint Margaret by Poussin are known to exist, each differing in details and composition, fueling scholarly debate about their sequence and original patron.

The Prado’s example is especially prized for its clarity and restraint, qualities praised by early admirers. In the words of a 17th-century inventory, the painting was valued for its "gravity and sweetness, united in the figure of the saint." The moment Poussin selects is the aftermath of Saint Margaret’s miraculous escape from the dragon, a symbol of evil and persecution. Margaret stands calm and dignified, her gaze lifted heavenward, the broken chains at her feet signifying her spiritual triumph.

The dragon, subdued and almost secondary, coils at the lower edge, its menace neutralized by the saint’s serene faith. Poussin’s palette is restrained, the light falling gently across Margaret’s white robe, emphasizing her purity and steadfastness. Unlike Raphael’s Saint Margaret, where the drama of the dragon’s attack dominates, Poussin’s focus is on the quiet heroism of endurance, not the violence of the miracle. The exact commission for Saint Margaret remains uncertain, though it likely originated with a private Roman collector seeking a devotional image with intellectual gravitas.

Over the centuries, the painting’s attribution has never seriously wavered, thanks to Poussin’s characteristic compositional rigor and the precise handling of drapery and gesture. By the 19th century, Saint Margaret had entered the Spanish royal collection, eventually finding its home in the Museo del Prado. Today, it stands as a testament to Poussin’s ability to infuse even the most unusual of saints’ legends with psychological depth and classical order, marking a subtle but significant chapter in his exploration of Christian themes.