A history of the foundation of St Mary’s abbey, Leicester names “Amiciam primogenitam…et Margaritam juniorem” as the two daughters of “Robertus” and his wife “Petronillam filiam Hugonis de Grantmenyl”, adding that Margaret married “Sayero de Quincy”. "Seherus de Quency comes Wintonie" donated "ecclesiam de Gasc" to Inchaffray Abbey, for the souls of "patris nostri bone memorie Roberti de Quency et…matris nostre Orable et…Roberti de Quency primogeniti nostri et…Margarete uxoris nostre" by charter dated to [1210/13]. A charter of King Edward I confirmed donations to Garendon Abbey among which by “Margareta…comitissa Wyntoniæ, soror Roberti comitis Leycestriæ”.
The necrology of the monastery of Ouche records the death "12 Jan" of "Margarita comitissa Wintonyæ". The necrology of Garendon abbey (Leicestershire) records the death “XVIII Kal Feb” of “Margareta comitissa Wintonie et mater...Rogeri de Quyncy”. 1
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After 11 Feb 1223
Margaret countess of Winchester has made fine with the king by 400 m. that Hawise, her daughter, may be married to Hugh, son and heir of R. de Vere, formerly earl of Oxford, of which she is to render 100 m. to the king at Easter in the seventh year, 100 m. at Michaelmas in the same year, 100 m. at Easter in the eighth year, and 100 m. at Michaelmas next following in the same year.
Calendar of Fine Rolls, 7 Hen. III, 83
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19 Nov 1233, Hereford
Margaret, countess of Winchester, has made fine with the king by 40 m. for having seisin of the manor of Marden , formerly of Gilbert Basset, which is of the fee of the same countess, without prejudice to the right of each who will wish to claim right in the said manor, and she has given the king surety for the aforesaid 40 m. by Roger de Quincy, her son....
Calendar of Fine Rolls, 18 Hen. III, 32
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19 Feb 1235, Westminster
Roger de Quincy, son and heir of Margery [sic] de Quincy, formerly countess of Winchester, has made fine with the king by £100 for his relief for all lands formerly of the same countess which fall to him by hereditary right, and he has found the king pledges for this, namely Hamo Peche for £50 and Ralph fitz Nicholas for £50, and the king has taken his homage for the aforesaid lands. Order to Richard de la Lade and Adam son of William, the king’s escheators, to cause Roger to have full seisin of all lands formerly of the same countess, of which she was seised on the day she died and which are in the king’s hand.
27 Mar 1235, Northampton
The king has granted to Roger de Quincy that, of the fine of £100 which he made with him for his relief of the lands formerly of Margaret de Quincy, formerly countess of Winchester, his mother, he may render £50 at the Exchequer at Pentecost in the nineteenth year and £50 at Michaelmas in one month in the same year. Order to the sheriff of Cambridgeshire and Huntingdonshire to permit him to have the aforesaid terms for the aforesaid £100 and to cause his livestock to be delivered to him in the meantime, if he has taken any for the aforesaid reason.
Calendar of Fine Rolls, 19 Hen. III, 136, 204a
Also referred to as Margaret DE BRETEUIL, Heiress of Groby.