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Ælfthryth of Wessex (c. 877 – 7 June 929), also known as Elftrudis (Elftrude, Elfrida), was an English princess and a countess consort of Flanders to Baldwin II.
Baldwin notes that neither the Annales Blaniniensis, the only source for the year of her death, nor her "claimed epitaph" at Saint-Pierre de Gand, which is only source for the date, is contemporary.