• Born: Bramber, Sussex, England
• Married:
• Died: After 5 Feb 1227/8

  Research Notes:

“Willielmus comes de Ferrariis” donated property to Tutbury Priory, for the soul of “uxoris meæ Sibillæ et liberorum meorum”, by charter which names “antecessores mei…Henricus de Ferrariis et Engenulphus et Robertus avus meus et Robertus comes pater meus”. “Robertus [mistake for Willielmus] comes de Ferrariis” donated property to Dore Abbey, for the souls of “Sibilla de Braosa, uxoris meæ matris W. filii mei et sua, et…Bertæ (fuit filia Milonis comitis Herefordiæ) matris uxoris meæ”, by undated charter. The Complete Peerage states that this charter is considered to be a fabrication, and that there is no other proof of the parentage of William’s wife. However, another document indicates Sibyl’s parentage: a charter of John King of England relating to Briouse properties, dated 1212, recites the history of the king’s turbulent relationship with the family and includes a record that “Willielmus de Breosa...Matildis de Heya uxor sua et W. comes de Ferar. nepos suus et Adam de Porter qui sororem suam habuit in uxorem” petitioned the king (presumably in [1209/10]). While confirming that the mother of William de Ferrers Earl of Derby was the sister of William [III] de Briouse, this document does not state that she was the same daughter of William [II] de Briouse who married Adam de Port. Confirmation of this fact awaits the emergence of a primary source which records that Adam’s second wife was named Sibyl. ¹

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He [William de Ferrieres] 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 Miles (DE GLOUCESTER), EARL OF HEREFORD. He died on Crusade, at the siege of Acre, in palestine, in 1190, before 21 October. His wife survived him, and married 2ndly Adam de Port, Lord of Basing, who died 1213, and was, perhaps, living as late as 5 February 1227/8. ²