What is John Spencer-Churchill, 11th Duke of Marlborough?
{{Infobox person |name=<small>[[His Grace]]</small> <br> The Duke of Marlborough <br> <small>[[Deputy Lieutenant|DL]] [[Justice of the Peace|JP]]</small> |image = 11th Duke of Marlborough Allan Warren.jpg |caption = The Duke of Marlborough in 1984 |birth_date= {{birth date|1926|4|13|df=y}} |birth_place=[[Blenheim Palace]], [[Oxfordshire]], [[England]] |death_date={{death date and age|2014|10|16|1926|4|13|df=y}} |death_place=Blenheim Palace, Oxfordshire, England |parents=[[John Spencer-Churchill, 10th Duke of Marlborough|John Spencer-Churchill]]<br>Alexandra Mary Hilda Cadogan |spouse=Susan Mary Hornby<br>[[Athina Livanos]]<br>[[Rosita Spencer-Churchill, Duchess of Marlborough|Countess Rosita Douglas]]<br>Lily Sahni |children=[[John Spencer-Churchill, Earl of Sunderland|John Spencer-Churchill]]<br>[[Jamie Spencer-Churchill, Marquess of Blandford|Jamie Spencer-Churchill]]<br>[[Lady Henrietta Gelber|Henrietta Spencer-Churchill]]<br>Richard Spencer-Churchill<br>Edward Spencer-Churchill<br>Alexandra Spencer-Churchill }} '''John George Vanderbilt Henry Spencer-Churchill, 11th Duke of Marlborough''', [[Deputy Lieutenant|DL]], [[Justice of the Peace|JP]]<ref>{{cite web |url= http://hansard.millbanksystems.com/people/mr-john-spencer-churchill |title= Mr. John Spencer-Churchill (Hansard) |publisher= Hansard.com |access-date= 2014-08-28 |archive-date= 2013-11-02 |archive-url= https://web.archive.org/web/20131102000459/http://hansard.millbanksystems.com/people/mr-john-spencer-churchill |url-status= dead }}</ref> (13 April 1926 &ndash; 16 October 2014) was a [[British people|British]] educator. He was the principal of a school in his birthplace of [[Blenheim Palace]]. He was the son of Lt.-Col. [[John Spencer-Churchill, 10th Duke of Marlborough]] and his wife, Hon. Alexandra Mary Hilda Cadogan. He was also a relation of [[Duke of Devonshire|The Duke of Devonshire]] and a generational cousin of the war-time [[Conservative Party (UK)|Conservative]] Prime Minister, [[Winston Churchill|Sir Winston Churchill]]. He was also a di