Mabel de Bellême Medieval French countess (1030–1077) Parents Hildeburgis William II Talvas Children Roger III de Montgomery Matilda de Montgomery Sibyl of Montgomery Hugh of Montgomery, 2nd Earl of Shrewsbury Roger the Poitevin Philip de Montgomery Robert of Bellême, 3rd Earl of Shrewsbury Arnulf de Montgomery Siblings Arnold of Bellême Partners Roger de Montgomerie, 1st Earl of Shrewsbury