Sigfried married Elstrude De FLANDERS, COUNTESS OF GUISNES about 930 in Of, Guisnes, Neustria. Elstrude (daughter of Arnoul I, Count Of FLANDERS and Adèle de VERMANDOIS, Countess of Flanders) was born about 932 in Of, , Flandres; and died. [Group Sheet] [Family Chart]