Dear Newsgroup ~
Complete Peerage 6 (1926): 470–471 (sub Hereford) had a good account of Sir John de Bohun, Earl of Hereford and Essex (died 1336), which individual is a well known grandson of King Edward I of England.
Regarding Sir John de Bohun's 2nd marriage, the following information is provided by Complete Peerage:
"He married, 2ndy, Margaret, daughter of Ralph (Basset), Lord Basset of Drayton, by Joan, daughter of John (de Grey), Lord Grey of Wilton. He [John de Bohun] died s.p., 20 Jan. 1335/6, at Kirkby Thore, co. Westmorland, and was buried at Stratford Abbey, near London. His widow's marriage was granted, 21 March 1335/6, to John de Beauchamp, brother of Thomas, Earl of Warwick, if she will to marry him, which she does not appear to have done. She had assignment of dower 16 Apr. and 23 May 1336. As Margaret, Countess of Hereford and Essex, she had letters of attorney, 7 Oct. 1344, on going to Santiago and other holy places of pilgrimage in foreign parts for a year. On 1 Dec. 1347 she had a grant of £14 rent in Waresley, Hunts, instead of the manor of Debden, Essex, which she held in dower." END OF QUOTE.
As we see above, Sir John de Bohun's surviving widow, Margaret Basset, was last known to be living 1 December 1347.
Besides the above information regarding Margaret Basset supplied by Complete Peerage, I can add the following additional facts of her life:
In 1346 the king ordered her to provide 6 men-at-arms and 12 archers for the Siege of Calais. Reference: Wrottesley, Crécy & Calais (1898): 103, which may be viewed at the following weblink:
https://books.google.com/books?id=dcNnAAAAMAAJ&pg=PA103
In Easter term 1348 Margaret, Countess of Hereford sued Thomas de Loundres, parson of the church of Pertenhale, Bedfordshire, and another in the Court of Common Pleas regarding a trespass [vi et armis] at Kimbolton, Huntingdonshire. Reference: Court of Common Pleas, CP40/354, image 1291, available at the following weblink:
http://aalt.law.uh.edu/E3/CP40no354/bCP40no354fr201toEnd/IMG_1291.htm).
In summary, we find that Margaret Basset, Countess of Hereford and Essex, was living as late as Easter term 1348.
Best always, Douglas Richardson, Salt Lake City, Utah