Called Margaret in some secondary sources.
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John Hunt states that “William le Gros” was married to “a sister of William Marshal I earl of Pembroke”, when recording the marriage contract of the couple’s daughter Margaret to “Ralph Somery” [Ralph [II] de Somery, dated to before 1194, but he does not cite the primary source on which the information is based. A relationship between the Marshal and Crassus families is suggested by two sources. Firstly, William Marshal Earl of Pembroke, writing to King Henry III dated 5 Aug 1224, records that he had sent "dominum W. Grassum primogenitum consanguineum nostrum" with soldiers "ad Enoc-fergus in Ultonia" [Carrickfergus] which was besieged by "Hugonem de Lascy". Secondly, the Annals of Worcester record the consecration in 1230 of “Anselmus nepos Marescalli...apud Cantuariam in episcopum Menevensem” [as bishop of St David’s]. 1