William de Ferrers III Earl of Derby & Sibilla Marshal 
William de Ferrers III and Sibilla 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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Personal Details
William de Ferrers III Earl of Derby
William de Ferrers III was born about 1193 in of Derbyshire, England. He died in Evington, Leicestershire, England.
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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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