The Plantagenet Ancestry, by William Henry Turton, 1968
- References (67)
- Individual: William De Vernon 5th Earl Of Devon
- Individual: Hildegarde of Flanders
- Individual: Adele De Boulogne
- Individual: Adalbert Count de Gand
- Individual: King of Italy Holy Roman Emperor Louis II
- Individual: Waleran Lord De Beaumont Count Of Meulan
- Individual: Gilbert Lord De Meath De Lacy
- Individual: "The Great" Count of Frisia Arnulf
- Individual: Count of West Friesland Dietrich II
- Individual: Osbern I de Bolbec Seigneur de Longueville-sur-Scie
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