Pact allegedly signed between Urbain Grandier and the Devil, produced to court during the 1634 Loudun Possession Trial. This image from Dictionnaire infernal ou Bibliothèque universelle… by Collin de Plancy (1826)

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The Loudun possessions were a group of supposed demonic possessions which took place in Loudun, France, in 1634. This case involved the Ursuline nuns of Loudun who were allegedly visited and possessed by demons:

Father Urbain Grandier was convicted of the crimes of sorcery, evil spells, and the possessions visited upon the Ursuline nuns, based on the words of possessed nuns. Until the Aix-en-Provence possessions of 1611, the words of the possessed nuns would not have been considered valid evidence.