Notes: Æthelstan 26 Half-King was the son of Ealdorman Æthelfrith 3 and Æthelgyth 1, and brother to Ealdorman Ælfstan 27 of Mercia, Ealdorman Æthelwald 42 of Kent and the South-East, and Ealdorman Eadric 14 of Wessex. The Half-King was married to Ælfwynn, and their son, Æthelwine 2 succeeded him in his role as ealdorman. See also Æthelstan 37.
BDDAB, p. 51; BEASE, p. 17; CDNB 1:945; DNB 18:35 = 6:899; Fletcher, pp. 162-3; Hart, ECNE, p. 299; C. Hart, The Danelaw, pp. 569-604; C. Hart, ?Æthelstan (fl. 932?956)?, ODNB.