Baldwin married Aelfthryth Elfrida "Lady of Mercia" Princess of England WESSEXFlanders, Nord, Nord-Pas-de-Calais, France. Aelfthryth (daughter of Alfred "The Great" (King of Wessex) 1 and Ealhswith Alswith (Princess of Mercia and Gaini) 1) was born in 869 in Wessex Kingdom, Anglo Saxon, England; died on 7 Jun 929 in Flanders, Interred St Peters Abbey, Ghent, Belgium. [Group Sheet] [Family Chart]

1. Arnulf Arnold I The Old Comte of Flanders (maid. name 1) was born on 12 Dec 889 in Ghent, Flanders (now Belgium); died in 965 in St Peters, Ghent, East Flanders, Belgium.