Back in medieval times, the thirteenth day after the Witches' sabbath of Halloween was considered a day of darkness, evil, and misfortune.
It was believed to be a time when necromancers and sorcerers of the left-handed path summoned up evil spirits and demons to assist them in their practice of the Black Arts. In some parts of the world, the old superstition persists that if the thirteenth day after Halloween falls on a Friday, all persons born on that day will possess the power of the evil eye.
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Source - Wicca Today
Image - Wallpapercave
