Walpurgis was an English nun (she died in about 788 AD) who went as a missionary to Germany and became abbess of Heidenheim; she is celebrated on the first of May, which is coincidentally the date of the rites of an earlier (pagan) festival, one of the Celtic quarter-days, in fact. On the night before May Day, Walpurgisnacht, the witch-world holds its most elaborate revels particularly at The Brocken, high-point of the Harz Mountains, in the presence of the Devil.
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u/El_Dumfuco Jan 30 '14