William de Ferrers III Earl of Derby 
William de Ferrers III was born about 1193 in of Derbyshire, England. William de Ferrers III's father was William de Ferrers II Earl of Derby and his mother was Agnes le Meschines of Chester. He had three brothers and two sisters, named Thomas, Hugh, Robert, Sybil and Joane. He died in Evington, Leicestershire, England.General Notes
William de Ferrers, 7th Earl of Derby, upon doing homage in the 32nd Henry III [c. 1248], had livery of Chartley Castle and the other lands of his mother's inheritance; and the same year he sat in the parliament held in London wherein the king made so stout an answer to the demands of his impetuous barons. His lordship m. 1st, Sibel, one of the daus. and co-heirs of William Mareschal, Earl of Pembroke, by whom he had seven daus., viz., Agnes, m. to William de Vesci; Isabel m. 1st to Gilbert Basset, of Wycombe, and 2ndly, to Reginald de Mohun; Maud, m. 1st to William de Kymes; 2ndly to William de Vyvon, and 3rdly, to Emerick de Rupel Carnardi; Sibil m. 1st to John de Vipont, 2ndly to Franco de Mohun; Joane m. to William Aguillon, and 2ndly to John de Mohun; Agatha m. to Hugh Mortimer of Chelmersh; Eleanor m. 1st to William de Vallibus, 2ndly to Roger de Quincy, Earl of Winton, and 3rdly to Roger de Leybourne, but had no issue. The earl m. 2ndly Margaret, one of the daus. and co-heirs of Roger de Quincy, Earl of Winchester, and had issue: Robert, his successor; William, upon whom his mother conferred the lordship of Groby, co. Leicester; Joan, m. Thomas, Lord Berkeley; and Agnes, m. to Robert de Muscegros, Lord of Deerhurst.
His lordship, who from his youth had been a martyr to the gout, and in consequence obliged to he drawn from place to place in a chariot, lost his life by being thrown through the heedlessness of his driver over the bridge at St. Neots, co. Huntingdon, in 1254. He was survived by his eldest son, Robert de Ferrers, 6th Earl of Derby. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 197, Ferrers, Earls of Derby]
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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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.
William de Ferrers III and Margaret were married in a religious ceremony in 1238. They had two sons and four daughters, named Robert de Ferrers, Sir William, Agnes, Elizabeth, Joan and Berta.
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Children
Robert de Ferrers Earl of Derby
Robert de Ferrers was born in 1239 in of Derby, Lincolnshire, England. He died at the age of 40 in 1279.
Sir William de Ferrers IV of Groby
Sir William was born in 1240 in of Groby, Leicestershire, England. He died at the age of 47 on December 20th, 1287.
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