Soldier and statesman, John Churchill, 1st Duke of Marlborough, was also a brother to James FitzJames' mother.
James FitzJames, 1st Duke of Berwick, 1st Duke of Fitz-James, 1st Duke of Liria and Jrica (21 August 1670  12 June 1734) was an Anglo-French military leader, illegitimate son of King James II of England by Arabella Churchill, sister of the 1st Duke of Marlborough. 
General John Churchill, 1st Duke of Marlborough, 1st Prince of Mindelheim, 1st Count of Nellenburg, Prince of the Holy Roman Empire, ( , often ; 26 May 1650 16 June 1722 O.S. ) was an English soldier and statesman whose career spanned the reigns of five monarchs. 
