After giving some examples of the links between astral magic and the political sphere or model (political goals of certain talismans, therapeutic astral magic at the service of powerful people, use of hierarchies of demonic powers), the article focuses on William of Auvergne’s analysis of the stakes of power in the magic art. The Bishop of Paris underlines the logical impasse to which the political power attributed to a magician would lead, and he shows the insuitability of the comparison between (...) the astrological talisman and the royal seal that supporters of this practice could put forward. (shrink)