From William of Newburgh's 12th-century chronicle, "History of English Affairs," these stories aren't really about Halloween, but they do feel a little Halloween-ish. There's no Michael Myers, zombies, or vampires, but there are strange portents in the sky, toads locked in stone, faerie banquets, green children, and a good number of demons.
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3 Things:
At Medievalists.net, an article on the history of monsters, monstrosity, and dehumanization.
On the British Library's medieval manuscripts blog, charms against evil from their collection.
Sources:
The Church Historians of England, translated by Joseph Stevenson. Seeley's, 1856.
Watkins, C.S.. History and the Supernatural in Medieval England. Cambridge University Press, 2007.