Source: Robert de Ferrers, Earl of Derby, in the Foundation for Medieval Genealogy ~http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL1.htm#RobertFerrersDerbydied1139B [See document in the Memories section]
	Description
	
		
			| Type | Valeur | 
	
	
		
			| Titre | Robert de Ferrers, Earl of Derby, in the Foundation for Medieval Genealogy ~http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL1.htm#RobertFerrersDerbydied1139B [See document in the Memories section] | 
	
 
	Notes
	
		
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			| Robert de Ferrers, Earl of Derby, in the Foundation for Medieval Genealogy ~http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL1.htm#RobertFerrersDerbydied1139B [See document in the Memories section] |