Robert FITZHAMON , Lord of Glamorgan
Earl of Gloucester. Lord of Creully in Calvados, Governor of Caen. Only referred to as Earl of Gloucester by Dugdale. The Complete Peerage Vol. V., p. 683. (from Royal & Noble Genealogical Data: http://www.dcs.hull.uk/public/genealogy/GEDCOM.html.)
Robert Fitz Hamon was the son of the Sheriff of Kent and was Married to Sibyl Montgomery the daughter of Roger De Montgomery the Earl of Shrewsbury who held vast lands in Wales. It was Fitz Hamon who established the first castle at Cardiff and was given Glamorgan as his fief and it seems very likely that Gilbert would have held lands there as a vassal of Fitz Hamon.
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