Sibilla Marshal 
Sibilla was born in 1204 in of Pembroke, Pembrokeshire, Wales. Sibilla's father was Sir William Marshal Earl of Pembroke and her mother was Isabel de Clare Cts de Strigoil. She had five brothers and five sisters, named William Marshal II, Gilbert Marshal, Richard Marshal, Walter Marshal, Anselm Marshal, Margaret, Maud, Isabella, Johanna (Joan) and Eva. She was the second youngest of the eleven children. She died about 1254.General Notes
Sibyl m. to William de Ferrers, Earl of Derby, to whom she brought Kildare. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 358, Marshal, Earls of Pembroke]
Sibilla and William de Ferrers III were married in a religious ceremony before May 14th, 1219. They had a son and eight daughters, named Sir John, Agnes, Isabel, Sybil, Joane, Agatha, Eleanor, Maud and Vyvien.
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Children
Agnes de Ferrers
Agnes was born in 1224 in of Derbyshire, England. She died at the age of 66 on May 11th, 1290.
Isabel de Ferrers
Isabel was born in 1226 in of Derbyshire, England. She died before November 26th, 1260.
Sybil de Ferrers
Sybil was born in 1230 in of Derbyshire, England. She died after October 5th, 1273.
Joane de Ferrers
Joane was born in 1232 in of Derbyshire, England. She died at the age of 35 in October 1267.
Agatha de Ferrers
Agatha was born in 1234 in of Derbyshire, England. She died at the age of 72 on May 22nd, 1306.
Eleanor de Ferrers
Eleanor was born in 1236 in of Derbyshire, England. She died at the age of 38 on October 26th, 1274.
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