In what castle did Nancy Astor, the first woman seated as a Member of Parliament in Britain, pass away?

Lady Nancy Astor (1879-1964), the first female Member of Parliament to take her seat, spent her final years at her daughter's, also called Nancy Astor, home at Grimsthorpe Castle in Lincolnshire, passing away on 2nd May 1964. Astor was an American-born English politician and socialite who was the first woman to sit as a Member of Parliament (MP) in the House of Commons, serving from 1919 to 1945.

Rising majestically within a 3,000-acre (12 sq. km) park of rolling pastures is Grimsthorpe Castle, a country house in the South Kesteven district of Lincolnshire. It remains the home of Jane Heathcote-Drummond-Willoughby, 28th Baroness Willoughby de Eresby, the granddaughter of Lady Nancy Astor. Grimsthorpe has been the home of the de Eresby family since 1516.

Lady Willoughby was one of the six Maids of Honour at the 1953 coronation of Queen Elizabeth II. She created the Grimsthorpe and Castle Trust, which safeguards the house, its contents and park. Lady Willoughby never married and thus has no children. There are currently two co-heir presumptive: cousins Sebastian St Maur Miller and Sir John Aird.

Grimsthorpe Castle is not a castle in the conventional sense of the word, but any buildings with crenellated towers had the right to apply for castle status. The impressive front of the house was designed by Sir John Vanbrugh (1664-1726), who is perhaps best known as the designer of Blenheim Palace.