http://archiver.rootsweb.ancestry.com/th/read/GEN-MEDIEVAL/2015-10/1444067762
From: Douglas Richardson
Subject: Complete Peerage Addition: Death date of Hawise de Quincy, Countessof Oxford
Date: Mon, 5 Oct 2015

Complete Peerage 10 (1945): 213-216 (sub Oxford) has a good account of the life of Sir Hugh de Vere, 4th Earl of Oxford, hereditary Master Chamberlain of England, who died in 1263. Regarding his marriage, the following information is given:

"He married, after 11 Feb. 1222/3, Hawise, daughter of Saher (de Quincy), 1st Earl of Winchester, by Margaret, younger sister and coh. of Robert (FitzPernel), 4th Earl of Leicester. He died before 23 Dec. 1263, and was buried at Earls Colne. His wife survived him, d. 3 Feb. (year unknown), and was buried at Earls Colne." END OF QUOTE

Footnote a on page 216 further reveals that Hawise de Quincy "was living in 1273 (Essex Feet of Fines, vol. ii, p. 2)."

>From these details, we learn that Hawise de Quincy, widow of Sir Hugh de Vere, was living in 1273, and died 3 February, year unknown.

Recently I located a Common Pleas lawsuit which pinpoints the year of Hawise de Quincy's death date a bit better. Here is a brief abstract of the lawsuit:

In Easter term 1279 John de Lovetot and William de Caneles, parson of the church of Lavenham, as executors of Hawise de Veer, Countess of Oxford, sued Philip de Saint Osith in the Court of Common Pleas regarding a debt of £200.

The actual lawsuit may be viewed at the following weblink:

http://aalt.law.uh.edu/E1/CP40no29/aCP40no29fronts/IMG_0463.htm

Thus, it would appear that Hawise de Quincy, Countess of Oxford, died testate before Easter term 1279.

As an aside, I might add that John de Lovetot, one of her executors, was Sir John de Lovetot, a justice of the Common Pleas. In the early 1270s he was steward of Norwich Cathedral Priory and in service to Robert de Vere, Earl of Oxford, possibly as his steward.

http://archiver.rootsweb.ancestry.com/th/read/GEN-MEDIEVAL/2015-10/1444079896
From: Peter Stewart
Subject: Re: Complete Peerage Addition: Death date of Hawise de Quincy,Countess of Oxford
Date: Tue, 6 Oct 2015

Hawise may have died by 1277 - in that year a fee in Leyton, Leicestershire, that she had held in November 1270 (Calendar of Inquisitions post mortem, vol 1 no. 776, p. 257) was held by her son Robert de Vere, earl of Oxford (Report on the Manuscripts of the late Reginald Rawdon Hastings, Historical Manuscripts Commission (1928-1947) vol. 1, p. 330).