From "Some corrections and additions to the Complete Peerage: Volume 5: Ferrers of Chartley..." 2
Volume 5, page 308:
He [Sir John de Ferrers, Lord Ferrers (d.1312)] m. ... Hawise, da. and h. of Sir Robert DE MUSCEGROS ... by Agnes, his wife.(c)
Note c:
According to the usual account, this Agnes was da. of William, Earl of Derby, by his second wife, Margaret de Quency. This is obviously impossible, for it would make John and Hawise first cousins.
Hawise must have been the daughter of Sir Robert de Muscegros by a wife previous to Agnes, as there is good evidence to support the "usual account", that Agnes was the daughter of William de Ferrers, earl of Derby, by Margaret, the daughter of Roger de Quency.
In 7 Edward I [1278 or 1279], Robert de Muscegros and Agnes held two thirds of the manor of Chinnor, Oxfordshire in free marriage, the other third being held by Oliver la Zouche [Rot. Hundredorum, vol.2, p.783]. This manor had been held by the de Quencys, and evidently divided among the three daughters and coheirs of Roger de Quency (d.1264) - Margaret, who married William de Ferrers, earl of Derby, Elizabeth, who married Alexander Comyn, earl of Buchan and Helen, who married Sir Alan la Zouche [Victoria County History, Oxfordshire, vol.8, p.58; Oliver la Zouche was a younger son of Sir Alan and Helen - see Complete Peerage, vol.12, part 2, p.934, note g]. In a charter concerning Sydenham, a hamlet of Chinnor, Agnes refers to Roger de Quency as her grandfather [Sir Christopher Hatton's Book of Seals, ed. L.C. Loyd and D.M. Stenton, no 95 (1950)]. There is a note of another charter in which she refers to Margaret de Ferrers, countess of Derby, as her mother [British Library, Add. MS, pencil fo.164].....
If Agnes had been Hawise's mother, this would have made Hawise the first cousin of her husband John de Ferrers (who was the grandson of William de Ferrers, earl of Derby). This was clearly not the case, because when in 1300 the couple sought a dispensation to marry, it was because they were related in a much more tenuous way - Hawise had previously been espoused to William de Mortimer, without having consummated the marriage, and William had been related to John in the third degree [Cal. Papal Letters, vol.1, p.588].
Hawise must therefore have been the daughter of a wife of Robert de Muscegros previous to Agnes. (Hawise was born 21 December 1276 [Cal. Inq. p.m., vol.2, no 404], and the first appearance of Agnes as Robert's wife is in 7 Edward I [1278 or 1279].) The fact that Agnes sold her marriage-portion, the manor of Chinnor, to Robert de Sapey and his wife Aline in 1313 suggests that she had no children by Robert de Muscegros [Victoria County History, Oxfordshire, vol.8, p.58].
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30 May 1281, Westminster
Grant to Roger de Mortuo Mari for a fine of 300 marks, which he will pay to the keeper of the king's works at Buelt, of the marriage of Hawisia, daughter and heir of Robert de Muscegros.
Mandate to Cicely de Muscegros, in whose custody the said Hawisia is, to deliver her to the said Roger.
Calendar of Patent Rolls, Edw. I, vol. 1, p. 441
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In 1313...Hawise was disputing with Alice, widow of Walter de Beauchamp, regarding the advowson of Kemerton, Gloucestershire. Sometime in the period, c.1314-15, the king took the lands of Hawise, late the wife of John de Ferrers, into his hands because she reportedly married with the king's licence; she stated, however, that she had not married. The king ordered that she give security to appear before the king at the next parliament to answer for the trespass and give account of the whole affair to the king... Hawise married (3rd) before 1315 John de Bures, Knt., in right of his wife, of Boddington, English Bicknor, and Longford, Gloucestershire, Aldworth, Berkshire, Alvescote, Oxfordshire, and Brewham, Charlton Musgrove, Norton Ferris, and Stowell, Somerset.... In 1318 John and his wife, Hawise, sold all their goods and moveable chattels in Kemerton and Aston super Carentam, Gloucestershire, to John de Annesleye and his wife, Lucy. He and his wife, Hawise, presented to the church of Charlton Musgrove, Somerset, in 1322.... In 1327/8 John and Hawise sued Joan widow of Thomas de Ferrers for dower in Essex. In 1329 they settled the manor of Stowell, Somerset, on her daughter, Pernel de Ferrers. In 1336 Robert de Stoke and Margaret his wife sued John and his wife, Hawise, for land in West Compton, Berkshire. In 1339 John and his wife, Hawise, were sued by Henry de Pusey regarding the manor of Alvescote, Oxfordshire.... 3
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