She was the daughter of William II de Braose and Bertha FitzMiles and wife of (1) William de Ferrers Earl of Derby and (2) Adam de Port
SIBYL (-after 5 Feb 1228). “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. However, 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.
Sybil m. firstly WILLIAM de Ferrers Earl of Derby, son of ROBERT de Ferrers Earl of Derby & his wife Margaret Peverel (-killed in battle Acre 1190 before 21 Oct).
She m. secondly, as his second wife, ADAM de Port, son of JOHN de Port & his wife Maud --- (1150/55-26 Jun/28 Jul 1213).
ADAM de Port m. secondly, as her second husband, SIBYL, widow of WILLIAM de Ferrers Earl of Derby, daughter of WILLIAM de Briouse Lord of Bramber & his wife Bertha of Hereford. 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). This source confirms the parentage of Adam’s second wife, but no source has yet been identified which confirms that her name was Sibyl and therefore that she was the same daughter of William de Briouse who had earlier married Earl William de Ferrers.
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