Sibyl Marshal 
Sibyl was born about 1191 in Pembroke, Pembrokeshire, Wales. Sibyl's father was William Marshal , 3rd Earl of Pembroke and her mother was Isabel de Clare , Countess of Pembroke. She had a brother and four sisters, named William, Maud, Eva, Isabel and Joan. She was the second oldest of the six children. She died before 1238.
Sibyl and William III de were married in a religious ceremony before May 14th, 1219 in 1st wife. They had five daughters named Isabel de, Agnes de, Maud (Matilda) de, Eleanor de and Joan de.
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Children
Isabel de Ferrers
Isabel de was born about 1220 in Derby, Derbyshire, England. She died before November 26th, 1260 in Torre Mohun, Devonshire, England.
Agnes de Ferrers
Agnes de was born about 1222 in Ferrers, Derbyshire, England. She died on May 11th, 1290 in Greyfriars, Scarborough, Yorkshire, England.
Eleanor de Ferrers
Eleanor de was born about 1232 in Derby, Derbyshire, England. She died before October 26th, 1274 in Leeds Priory, Kent, England.
Joan de Ferrers
Joan de was born about 1233 in Derby, Derbyshire, England. She died before October 1267 in Addington, Surrey, England.
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