(Est 1065-By 1139)
Eleanor DE TOTNES, Heiress of Barnstaple
Miles Fitz Walter DE GLOUCESTER, Earl of Gloucester
(Est 1095-1143)
(Est 1095-Aft 1143)
William DE BRAOSE, 10th Lord of Abergavenny
(Bef 1096-Aft 1175)
Bertha DE GLOUCESTER, Heiress of Brecon
(-Abt 1228)


Family Links

1. William DE FERRERS, Earl of Derby

2. Sir Adam DE PORT, Lord of Basing


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

  General Notes:

Compiler's 24 x great-grandmother

  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


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

  Marriage Information:

Sibyl married William DE FERRERS, Earl of Derby, son of Robert DE FERRERS, Earl of Derby, and Margaret PEVEREL. (William DE FERRERS died shortly before 21 Oct 1190 at the Siege of Acre, Palestine.)

  Marriage Information:

Sibyl also married Sir Adam DE PORT, Lord of Basing, son of John DE PORT, Lord of Basing, and Maud.


1 Foundations for Medieval Genealogy, Medlands, Sibyl.

2 Complete Peerage, IV:192-4, XIV:250.

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