Ælfthryth, Countess of Flanders Countess consort of Flanders (877-929) (0877–0929) Parents Ealhswith Alfred the Great Children Adelolf, Count of Boulogne Mathilde van Vlaanderen, Comtesse de St. Pol Ealswid of Flanders Arnulf I, Count of Flanders Ermentrude of Flanders Siblings Æthelgifu Edward the Elder Æthelflæd Æthelweard Edmund Partners Baldwin II
