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.
She was the youngest daughter of Alfred the Great, the King of the Anglo-Saxons and his wife Ealhswith. Her siblings included King Edward the Elder and Æthelflæd, Lady of the Mercians. Ælfthryth was educated along with her elder brother Edward, marking a rare instance of a princess getting equal education to a prince.
Between 893 and 899, Ælfthryth married Baldwin II (died 918), Margrave of Flanders. Ælfthryth died on 7 June 929 and was buried next to her husband at Saint Peter's Abbey in Ghent.
Arnulf I of Flanders (d. 964/65); married Adela of Vermandois
Adalulf, Count of Boulogne (d. 933)
Abels, Richard P. (1988). Lordship and Military Obligation in Anglo-Saxon England. British Museum Press. p. 189. ISBN 978-0-7141-0552-9.
Nicholas, David M (2013). Medieval Flanders. Routledge.
Vanderputten, Steven, ed. (2024). Judith of West Francia, Carolingian Princess and First Countess of Flanders: Biographical Elements and Legacy. Turnhout: Brepols. doi:10.1484/M.STMH-EB.5.132281. ISBN 9782503604619.
Ælfthryth 5 at Prosopography of Anglo-Saxon England