Sibilla del Vasto - Bef 1172 (1150–1200) Parents Agnes de Vermandois Boniface del Vasto Children William VII of Montpellier Adelais de Montpellier Siblings Oddone Boverio Enrico I del Carretto Manfred I, Marquess of Saluzzo Anselmo del Vasto Partners William VI of Montpellier