Saint Walpurga or Walburga (Old English: Wealdburg; c. 710 – February 25, 777 or 779), also spelled Valderburg or Guibor, was an English missionary to the Frankish Empire. She was canonized (made a saint) on 1 May ca. 870 by Pope Adrian II.
Walpurga's feast day is on 25 February. The day of her canonization, 1 May, was also celebrated during the high medieval period. Especially in the 11th century under Anno II, Archbishop of Cologne. Walpurgis Night is the eve of May Day, celebrated in folklore in Europe with dancing.