Agobard of Lyons also referenced a related belief amongst his parishioners--a belief that tempestarii were in league with a mythical race of cloud-dwellers who came from a land named 'Magonia' ("Land of Magic", "Land of Thieves").
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On the Tempestarii and Magonia see Valerie I. J. Flint, The Rise of Magic in Early Medieval Europe, Princeton Univ.
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John Fian and his alleged coven of witches were accused of raising a sea storm to drown James VI and Queen Anne on their way from Denmark.