SOURCE-17837Research NeededProbable
Charles Cawley, "Northern France, Nobility: COMTES de PONTHIEU (BELLÊME-MONTGOMM...
Full citation
Charles Cawley, "Northern France, Nobility: COMTES de PONTHIEU (BELLÊME-MONTGOMMERY)", Medieval Lands, Charles Cawley & Foundation for Medieval Genealogy, V 3.4: 1 February 2016, (http://fmg.ac/Projects/MedLands/NORTHERN%20FRANCE.htm#GuillaumeIPonthieudied1171B " accessed 6 April 2016).