Given the question: Information:  - The Hundred Years' War was a series of conflicts waged from 1337 to 1453 by the House of Plantagenet, rulers of the Kingdom of England, against the House of Valois, rulers of the Kingdom of France, over the succession of the French throne. Each side drew many allies into the war. It was one of the most notable conflicts of the Middle Ages, in which five generations of kings from two rival dynasties fought for the throne of the largest kingdom in Western Europe. The war marked both the height of chivalry and its subsequent decline, and the development of strong national identities in both countries.  - Princess of Wales is a British courtesy title held by the wife of the Prince of Wales, who is, since the 14th century, the heir apparent of the English or British monarch. The first acknowledged title holder was Eleanor de Montfort, wife of Llywelyn ap Gruffudd. It has subsequently been used by wives of post-conquest princes of Wales.  - Humphrey Stafford ( c. 1425 -- c. 22 May 1458 ) , generally known by his courtesy title of Earl of Stafford , was the eldest son of Humphrey Stafford , 1st Duke of Buckingham and Lady Anne Neville ( d. 1480 ) .  - Anne Neville (11 June 1456  16 March 1485) was an English queen, the daughter of Richard Neville, 16th Earl of Warwick (the "Kingmaker"). She became Princess of Wales as the wife of Edward of Westminster and then Queen of England as the wife of King Richard III.  - Westminster is an area of central London within the City of Westminster, part of the West End, on the north bank of the River Thames. Westminster's concentration of visitor attractions and historic landmarks, one of the highest in London, includes the Palace of Westminster, Buckingham Palace, Westminster Abbey and Westminster Cathedral.  - Stafford is the county town of Staffordshire, in the West Midlands of England. It lies approximately north of Wolverhampton, south of Stoke-on-Trent and north-west of Birmingham. The population in 2001 was 63,681 and that of the wider borough of Stafford 122,000, the fourth largest in the county after Stoke-on-Trent, Tamworth and Newcastle-under-Lyme.  - Duke of Buckingham, referring to Buckingham, is a title that has been created several times in the peerages of England, Great Britain, and the United Kingdom. There have also been Earls of Buckingham and Marquesses of Buckingham.  - Humphrey Stafford, 1st Duke of Buckingham (15 August 1402  10 July 1460) was an English nobleman. A great-grandson of King Edward III on his mother's side, he was a military commander in the Hundred Years' War and in the Wars of the Roses.    Given the information above, choose from the list below the object entity that exhibits the relation 'country of citizenship' with the subject 'humphrey stafford'.  Choices: - england  - france  - great britain  - kingdom of england  - london  - wales
The answer is:
kingdom of england