Sibylla of Anjou Countess of Flanders (1112-1165) (1112–1165) Parents Ermengarde, Countess of Maine Fulk, King of Jerusalem Children Gertrude of Flanders, Countess of Savoy Philip I, Count of Flanders Margaret I, Countess of Flanders Peter of Flanders Matilda de Flandre Matthew of Alsace Siblings Elias II, Count of Maine Geoffrey Plantagenet, Count of Anjou Matilda of Anjou Amalric I of Jerusalem Baldwin III of Jerusalem Partners Thierry of Lorraine, Count of Flanders William Clito