Elstrude de Flandre Peerage person ID=211991 Parents Adele of Vermandois Arnulf I, Count of Flanders Children Ardolf I of Guînes Siblings Baldwin III, Count of Flanders Liutgarde of Flanders Egbert of Flanders Hildegard of Flanders Ermengarde-Gerberga of Anjou unknown Flemensis Partners Siegfried I of Guînes