Sibyl Mortimer 
Sibyl's father was Lord Of Wigmore Roger De Mortimer Lord Of Wigmore and her mother was Isabel De Ferrers. Her paternal grandparents were Lord Of Wigmore Hugh De Mortimer Lord Of Wigmore and Maud De Meschines. She had four brothers named Ralph De, Roger, Robert and Philip. She had a half-brother and three half-sisters, named Hugh De, Miss De, Miss De and Joane (Isabel) De.
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