Margaret I, Countess of Flanders Countess suo jure of Flanders (1145-1194) (1145–1194) Parents Sibylla of Anjou Thierry of Lorraine, Count of Flanders Children Yolanda of Flanders Philip I of Namur Sybilla of Henao Henry of Flanders Baldwin I of Constantinople Eustace of Flanders Isabella of Hainault Siblings Philip I, Count of Flanders Matthew of Alsace Laurette of Flanders Peter of Flanders Gertrude of Flanders, Countess of Savoy Matilda de Flandre Baldwin de Flandre Partners Baldwin V, Count of Hainaut Ralph II, Count of Vermandois
