Mistress Masham's Repose by T H White (published in 1946) makes specific reference to Abigail, Baroness Masham.
Blenheim Palace and Stowe House are in turn linked in that Richard Temple, 1st Viscount Cobham, who developed the house and gardens at Stowe in the early eighteenth century, was a notable officer serving under the Duke of Marlborough.
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The name is an historical in-joke by White; it depends upon knowing that Blenheim was the first of the first duke's great battles, and Malplaquet was his fourth and last.
Masham | The Moon Is a Harsh Mistress | Elvira, Mistress of the Dark | To His Coy Mistress | Mistress of Mistresses | The Skeleton Count, or The Vampire Mistress | The Mistress of Spices (film) | The Mistress of Spices | Amy Brown (royal mistress) | Wittgenstein's Mistress | The Mistress | The Iron Mistress | The Dancing Mistress | Mistress Masham's Repose | Lying in repose | Katharine Fraser, Mistress of Saltoun | Baron Scrope of Masham | Angle of repose |