In a perception based on earlier historiography, John Julius Norwich spoke of her "total unfitness to govern," but the success of Stephen during his short tenure is undeniable and she is primarily blamed for her refusal to see the disaffection her relatives caused the local nobility. Jacqueline Alio, her biographer, gives Margaret credit for competent rule in trying circumstances, identifying her as the greatest Sicilian queen of the Norman-Swabian era. In the first biography of this queen, Alio describes her as "the most powerful woman in Europe for five eventful years" and "the most important woman of medieval Sicily". Alio also infers that Margaret and Constance, who would also become the queen regent, as sisters-in-law, knew each other, and young Constance had imitated the style of leadership of Margaret, so there might be a sisterhood between them if tenuous. (However, after the death of Henry the youngest son of Margaret in 1172, as the sole heir to William from then on, Constance remained confined to her monastery for the remainder of the lifetime of Margaret, whether out of the will of the latter or not.)
