Æthelstan's wife was named Ælfwynn. Her family came from the East Midlands. She was foster-mother of King Edgar of England. Ælfwynn's lands would later endow Ramsey Abbey, refounded by Bishop Æthelwold of Winchester, Bishop Oswald of Worcester, and Æthelstan's son Æthelwine. Byrhtferth of Ramsey, author of a "Life of Saint Oswald" in the early 11th century, devoted considerable space to Æthelstan's family, several of whom were buried at Ramsey. The epithet Half-King comes from Byrhtferth's writings. Several members of the family were buried, or reburied, at Ramsey.