William de Ferrières 3rd Earl of Derby
- Born: Abt 1130, England
- Marriage: Sibyl de Braose 141
- Died: Bef 21 Oct 1190, Siege of Acre, Palestine 141
 General Notes:
Cockayne's Complete Peerage (Stafford) identified him and Sibyl as William's parents. 141
Noted events in his life were:
• Background Information. 141
William de Ferrières, Earl of Derby & Ferrières, son and heir, was one of the adherents of the younger Henry on his rebellion in Apr 1173, and sacked and burnt Nottingham in May or June 1174. He made his submission to the King at Northampton, 31 Jul 1174, surrendering his castles of Tutbury and Duffield. The King took him, with other prisoners, to France in August following, and imprisoned them at Caen.
He married Sibyl, daughter of William de Braiose, Lord of Bramber, by Bertha (heiress of Brecon and Over Gwent), sister and coheir of William de Hereford, and 2nd daughter of Mildes de Gloucester, Earl of Hereford. He died on Crusade, at the siege of Acre, in Palestine, in 1190, before 21 Oct. His wife survived him, and married as her 2nd husband, Adam de Port, Lord of Basing, who died 1213, and was, perhaps, living as late as 5 Feb 1227/8.
~Cokayne's Complete Peerage, 2nd Edition, (Derby), Vol. IV, pp, 192-194 & Vol. VIV
William married Sibyl de Braose, daughter of William de Braose 3rd Baron Bramber. Lord Brecknock, Abergavenny and Bertha de Pîtres.141 (Sibyl de Braose was born about 1157 in Bramber, Sussex, England and died after 5 Feb 1227-1228 in England.)
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