William III de Ferrers , 5th Earl of Derby 
William III de was born about 1193 in Derby, Derbyshire, England. William III de's father was William II de Ferrers , 4th Earl of Derby and his mother was Agnes of Chester , Lady of Chartley. He had two sisters named Bertha de and Sibyl de. He was the oldest of the three children. He died before March 28th, 1254 in Evington, Leicestershire, England. He was buried on March 31st, 1254 in Sheriff of Lancaster.General Notes
William de Ferrers, buried 31 Mar 1254, Earl of Derby. [Magna Charta Sureties, line 88-3]
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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 III de and Sibyl 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.
William III de and Margaret de were married in a religious ceremony before 1238 in 2nd wife. They had two sons and four daughters, named Robert de, William IV, Elizabeth de, Joan de, Agnes de and Berta de.
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Children
Robert de Ferrers , 6th\Last Earl of Derby
Robert de was born in 1239 in Derby, Derbyshire, England. He died at the age of 40 in 1279.
William IV Ferrers , of Groby, Sir
William IV was born about 1240 in Derby, Derbyshire, England. He died on December 20th, 1287 in Groby, Leicestershire, England.
Elizabeth de Ferrers
Elizabeth de was born about 1242 in Derby, Derbyshire, England. She died after 1297.
Joan de Ferrers
Joan de was born in 1248 in Derby, Derbyshire, England. She died in St Augustine Priory, Bristol, Gloucestershire, England.
Agnes de Ferrers
Agnes de was born about 1252 in Derby, Derbyshire, England. She died after May 9th, 1281 in Charlton Musgrove, Wincanton, Somerset, England.
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