Source: William de Ferrers, 4th or 6th Earl of Derby, in Burke's Dormant, Abeyant, Forfeited and Extinct Peerages, pg. 197 [See document in the Memories section]
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			| Titre | William de Ferrers, 4th or 6th Earl of Derby, in Burke's Dormant, Abeyant, Forfeited and Extinct Peerages, pg. 197 [See document in the Memories section] | 
	
 
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			| Burke's Dormant, Abeyant, Forfeited and Extinct Peerages, pg. 197 | 
	
 
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			| William de Ferrers, 4th or 6th Earl of Derby, in Burke's Dormant, Abeyant, Forfeited and Extinct Peerages, pg. 197 [See document in the Memories section] |