m. (888) Ælfthryth of Wessex, dau. Alfred the Great. Issue:
Arnulf I of Flanders (c. 890–964)
m. Adela of Vermandois.
Adalulf (c. 890–933), Count of Boulogne.
Flandria illustrata, sive Descriptio comitatus istius per totum terrarum orbem celeberrimi, III tomis absoluta / ab Antonio Sandero [...]] author Sanderus, Antonius, 1586-1664 (viaf)51680321 publisher Coloniae Agrippinae : sumptibus Cornelii ab Egmondt et sociorum, 1641-1644. (image is of Boudewijn I).
Richardson, D. (2013). Royal Ancestrym V. pp. 495.
↑BAUDOUIN II The Bald, Count/Marquis of Flanders, 879-918, Count of Artois, Count of Boulogne, 898? -918, etc, 2nd and eldest surviving son and heir, born about 863-865. He married in 884 AELFTHRYTH (or ELSTRUDE) OF WESSEX, daughter of Alfred the Great, King of Wessex, by Ealswith, daughter of Aethelred Mucil, earldorman of the Gaini. She was born about 870. They had two sons, Arnulf (I) [Count/Marquis of Flanders] and Adalolf (or Adolf), and two daughters, Ealhswid and Ermetrude. BAUDOUIN II, Count/Marquis of Flanders, died in 918, probably 10 Sept. His widow, AElfthryth (or Elstrude), died 7 June 929. He and his wife were buried in the abbey of Saint-Pierre, Gand.
Bauldwin-2 and Flandre-5 appear to represent the same person because: They are intended to be the same person, Baudouin is Alfred's son-in-law not his son. Flandre is the correct Last Name at Birth, Baudouin and Bauldwin are both variations of his first name.