Note: Some people have this Margaret Deincourt, d. 2 Apr 1380, which would make it most unlikely for her to be mother of Walter Tailboys, b. 1391. However the Margaret who died 2 Apr 1380 was married to Sir Robert Tibetot, and was daughter of William Deincourt and Millicent la Zouche, aunt of this Margaret.
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He [Walter Tailboys] married Margaret (l). He died 20 or 21 September 1417. [Complete Peerage VII:358, (transcribed by Dave Utzinger)]
(l) Perhaps the Margaret, whose son and executor, John Taylboys, esq., was sued for a debt in 1444.