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Source: Kathleen Thompson, 'Being the Ducal Sister: The Role of Adelaide of Auma...
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Source: Kathleen Thompson, 'Being the Ducal Sister: The Role of Adelaide of Aumale', Normandy and its Neighbours 900–1250; Essays for David Bates, ed. David Crouch, Kathleen Thompson (Brepols Publishers, Belgium, 2011), p. 68