"Saint Walpurga or Walburga (Old English: Wealdburg, Latin: Valpurga, Walpurga, Walpurgis; c. AD 710 – 25 February 777 or 779), also spelled Valderburg or Guibor, was an Anglo-Saxon missionary to the Frankish Empire. She was canonized on 1 May c. 870 by Pope Adrian II. Saint Walpurgis Night (or "Sankt Walpurgisnacht") is the name for the eve of her feast day, which coincides with May Day." - (en.wikipedia.org 31.01.2020)
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