William I de Ferrers , 3rd Earl of Derby 
William I de was born in 1140 in Ferrers, Derbyshire, England. William I de's father was Robert de Ferrers , 2nd Earl of Derby and his mother was Margaret Peverel. His maternal grandmother was Avice de Lancaster. He was an only child. He died before October 21st, 1190 in Seige of Acre, Jerusalem, Palestine.General Notes
William de Ferrers, 3rd Earl of Derby, rebelled against Henry II and marching at the head of the Leicestershire men (19th Henry II) upon Nottingham, then kept for the king by Reginald de Luci, got possession of the town which he sacked, putting the greater part of the inhabitants to the sword and taking the rest prisoners. He was soon afterwards, however, reduced to submission and obliged to surrender to the crown his castles in Tutbury and Duffield, which were demolished by order of the king. His lordship m. Sibilla, dau. of William de Braose, Lord of Abergavenny and Brecknock, by whom he had issue. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 196, Ferrers, Earls of Derby]
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There is substantial confusion over his name. See The Complete Peerage Vol. 4, p 193 for an account. Personally, I feel there could have been two brothers, William and Robert, Robert being the Earl and when he died at Acre his nephew William [son of his brother William] succeeded, but no documents support this theory! In The Complete Peerage vol. XIV, p. 250 it is suggested that Robert is a fabrication by Vincent, Earl of Ferrieres. [Brian Tompsett, Directory of Royal Genealogical Data, http://www.dcs.hull.ac.uk/cgi-bin/gedlkup/n=royal?royal04492]
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Ancestor Pedigree Chart
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- b.~ 1118 in Ferrers, Derbyshire, England d.< 1160 in Merevale, Warwickshire, England
- b.1140 in Ferrers, Derbyshire, England d.<21 Oct 1190 in Seige of Acre, Jerusalem, Palestine
- b.~ 1118 in Nottingham, Nottinghamshire, England
- b.~ 1022 in St-Germain-de-Montgomery, Calvados, Normandy, France d.>27 Jul 1094 in Shrewsbury, Shropshire, England (clothed as a monk)
- b.1058 in St-Germain-de-Montgomery, Calvados, Normandy, France d.1123
- b.1026 in Alencon, Eure, Normandy, France d.02 Dec 1079 in Bures Castle, Eure, Normandy, France (murdered)
- b.1088 in Nottingham, Nottinghamshire, England d.1149
- b.~ 1010 in Marche, Creuse, Limousin, France d.1086
- b.1062 in Marche, Creuse, Limousin, France d.1116
- b.~ 1035 in France
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‌William I de and Sybil de were married in a religious ceremony about 1167 in Sussex, England. They had a son and three daughters, named William II de, Agatha de, Millicent de and Pernell (Petronella) de.
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Children
William II de Ferrers , 4th Earl of Derby
William II de was born in 1172 in Ferrers, Derbyshire, England. He died at the age of 75 on September 22nd, 1247.
Pernell (Petronella) de Ferrers
Pernell (Petronella) de was born about 1190 in Ferrers, Derbyshire, England.
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