Family: 5th Earl of Derby Sir William de Ferrers, III / Sibyl Marshall (F5202)
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Male
5th Earl of Derby Sir William de Ferrers, III
Birth 1200 Derbyshire, England 
Death 24 Mar 1254 Evington, Leicestershire, England Burial Warwickshire, England Marriage Other Spouse Margaret de Quincy | F5203 Marriage Father 4th Earl of Derby Sir William de Ferrers, II | F5119 Group Sheet Mother Agnes de Kevelioc | F5119 Group Sheet
Female
Sibyl Marshall
Birth 1209 Pembroke, Pembrokeshire, Wales Death 27 Apr 1245 Pembroke, Pembrokeshire, Wales Burial Father 1st Earl of Pembroke William Marshall, the Elder | F2729 Group Sheet Mother 4th Countess of Pembroke Isabella de Clare | F2729 Group Sheet
Female
Joan de Ferrers
Birth Abt 1233 Derbyshire, England Death Addington, Surrey, England Burial Spouse Knight of Munster John de Mohun, I | F3481 Marriage Abt 1245 Derby, Derbyshire, England