Marie I, Countess of Boulogne English princess (1136–1182) Parents Stephen, King of England Matilda of Boulogne Children Matilda of Flanders Ida, Countess of Boulogne Siblings Eustace IV, Count of Boulogne William I, Count of Boulogne Gervase of Blois Almaric (?) William (?) Ralph (?) Sybilla (?) Matilda de Blois Baldwin de Boulogne Partners Matthew of Alsace