Gilles de Rais was a heroic medieval knight who fought alongside Joan of Arc before suddenly retiring to his massive castle to try and summon demons using alchemy and terrifyingly dark magic.

From battlefield prestige to forbidden experiments

Gilles de Rais had been a powerful nobleman and military commander, and his service alongside Joan of Arc gave him a public identity very different from that of an occult seeker. In the years after his military career, accounts describe him turning toward alchemy and attempts to summon spirits. These pursuits belonged to a world in which educated people might seek hidden knowledge through books, ritual, and learned specialists—not simply through the image of a lone sorcerer chanting in a tower.

What “summoning demons” meant

Medieval ritual magic often drew on written instructions that claimed to prepare a practitioner to contact or control spirits. A ritual might prescribe prayers, diagrams, particular words, and carefully timed actions. Alchemy, the practical study of transforming and purifying materials, was a related but distinct pursuit; it was not itself the same as demon conjuring. To someone hoping for extraordinary results, both could promise access to powers beyond ordinary experience.

De Rais was said to have sought manuscripts and paid people who claimed they could help him summon demons. The familiar story that spirits were merely too shy to appear captures the frustration such a project could entail, but it should not be treated as a verified exchange. Ritual specialists could explain failure by saying that a ceremony had been performed incorrectly or that further preparations were needed—an arrangement that could keep a wealthy patron paying.

A risky pursuit with a lasting afterlife

The surviving picture comes largely through the proceedings against de Rais in 1440, when accusations of sorcery formed part of the case against him. Such records preserve claims made in a high-stakes trial, not an impartial diary of his private experiments. Still, the story shows why occult practice could become consequential: a nobleman’s money and status could support an expensive search for supernatural help, while alleged dealings with forbidden spirits could later be used to frame his character and conduct.

The striking contrast is not simply between a celebrated knight and a would-be magician. It is between the authority de Rais had gained in public life and the uncertain, costly promises of people who claimed to command an invisible world.