Question: Who was Henry Kitchener, 3rd Earl Kitchener's great uncle?

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Henry of Scotland: Henry of Scotland ("Eanric mac Dabíd", 1114 – 12 June 1152 ) was heir apparent to the Kingdom of Alba.  He was also the 3rd Earl of Northumberland and the 3rd Earl of Huntingdon.  He was the son of King David I of Scotland and Queen Maud, 2nd Countess of Huntingdon.  Henry was named after his uncle, King Henry I of England, who had married his paternal aunt Edith.

Richard Boyle, 3rd Earl of Burlington: Richard Boyle, 3rd Earl of Burlington and 4th Earl of Cork, {'1': ", '2': ", '3': ", '4': "} (25 April 169415 December 1753) was an Anglo-Irish architect and noble often called the "Apollo of the Arts" and the "Architect Earl".  The son of the 2nd Earl of Burlington and 3rd Earl of Cork, Burlington never took more than a passing interest in politics despite his position as a Privy Counsellor and a member of both the British House of Lords and the Irish House of Lords.

Earl of Thanet: Earl of the Isle of Thanet, in practice shortened to Earl of Thanet, was a title in the Peerage of England.  It was created in 1628 for Nicholas Tufton, 1st Baron Tufton.  He had already succeeded as second Baronet of Hothfield in 1631 and been created Baron Tufton, of Tufton in the County of Sussex, in 1626, also in the Peerage of England.  The Baronetcy, of Hothfield in the County of Kent, was created in the Baronetage of England in 1611 for his father, John Tufton.  Lord Thanet was succeeded by his son, the second Earl.  He married Lady Margaret Sackville, daughter of Richard Sackville, 3rd Earl of Dorset and Lady Anne Clifford.  Their son, the third Earl, successfully claimed the barony of de Clifford through his maternal grandmother Lady Anne (which had been in abeyance since the death of his great-grandfather George Clifford, 3rd Earl of Cumberland).

Charles Stanhope, 3rd Earl Stanhope: Charles Stanhope, 3rd Earl Stanhope aka Charles Mahon, 3rd Earl Stanhope FRS (3 August 1753 – 15 December 1816) was a British statesman and scientist.  He was the father of the great traveller and Arabist Lady Hester Stanhope and brother-in-law of William Pitt the Younger.  He is sometimes confused with an exact contemporary of his, Charles Stanhope, 3rd Earl of Harrington.  His lean and awkward figure was extensively caricatured by James Sayers and James Gillray, reflecting his political opinions and his relationship with his children.

Henry Kitchener, 3rd Earl Kitchener: Major Henry Herbert Kitchener, 3rd Earl Kitchener DL TD (24 February 1919 – 16 December 2011), styled Viscount Broome from 1928 to 1937, was a British peer.  He was the son of Captain Henry Franklin Chevallier Kitchener, Viscount Broome, only son of Henry Kitchener, 2nd Earl Kitchener.  His great-uncle was the renowned military commander Herbert Kitchener, 1st Earl Kitchener.

Earl de Grey: Earl de Grey, of Wrest in the County of Bedford, was a title in the Peerage of the United Kingdom.  It was created on 25 October 1816 (as Countess de Grey) for Amabell Hume-Campbell, Dowager Lady Polwarth and "suo jure" 5th Baroness Lucas, with remainder to the heirs male of her body and in default of such issue to her sister Mary Jemima Robinson, Dowager Baroness Grantham, and the heirs male of her body.  She was the eldest daughter and co-heir of Philip Yorke, 2nd Earl of Hardwicke, and Jemima Yorke, 2nd Marchioness Grey (see Marquess Grey), eldest daughter of John Campbell, 3rd Earl of Breadalbane and Holland, and Lady Amabel Grey, eldest daughter of Henry Grey, 1st Duke of Kent (see Duke of Kent).  The marquessate of Grey had become extinct on her mother's death in 1797 and when the Grey title was revived in favour of her daughter the style "de Grey" was used to distinguish it from the earldom of Grey which had been created in 1806; the Grey family was extremely distantly related to the Earl Grey).  The Countess de Grey was the widow of Alexander Hume-Campbell, Lord Polwarth, eldest son of Hugh Hume, 3rd Earl of Marchmont.

Connor O'Brien, 3rd Earl of Thomond: Connor O'Brien, 3rd Earl of Thomond (1534? –1581), called "Groibleach" (or Long-nailed), grandson of Conor O'Brien (d. 1539); succeeded to the earldom, 1553; his right to the lordship of Thomond was disputed by his uncle, Donnell; confirmed in his possessions by Thomas Radclyffe, 3rd Earl of Sussex in 1558, who proclaimed his uncles traitors, though peace was not established until 1565.  He intrigued with Fitzgerald in 1569, and fled to France; returned to Ireland and received pardon, 1571, with the restoration of his lands, 1573.

Herbert Kitchener, 1st Earl Kitchener: Field Marshal Horatio Herbert Kitchener, 1st Earl Kitchener, ( ; 24 June 1850 – 5 June 1916) was a senior British Army officer and colonial administrator who won notoriety for his imperial campaigns, most especially his scorched earth policy against the Boers and his establishment of concentration camps during the Second Boer War, and later played a central role in the early part of the First World War.

Earl of Ruglen: Earl of Ruglen was a title in the Peerage of Scotland.  Along with the subsidiary titles Viscount of Riccartoun and Lord Hillhouse, it was created on the 14th of April, 1697, for Lord John Douglas-Hamilton, fourth (third surviving) son of William Douglas-Hamilton, Duke of Hamilton, 1st Earl of Selkirk, and his wife Anne Hamilton, 3rd Duchess of Hamilton.  The 1st Earl of Ruglen succeeded as 3rd Earl of Selkirk on the death of his elder brother in 1739.  The Earl's only son William, Lord Daer, died in 1742, so on the death of the Earl of Selkirk and Ruglen in 1744, the Earldom of Selkirk passed to his great-nephew, while the Earldom of Ruglen passed to his daughter, Anne, who had married William Douglas, 2nd Earl of March.  On her death in 1748, the Earldom of Ruglen passed to her only child William, 3rd Earl of March.  He succeeded his first cousin once removed Charles Douglas as 5th Marquess and 4th Duke of Queensberry in 1778.

Henry Kitchener, 2nd Earl Kitchener: Colonel Henry Elliott Chevallier Kitchener, 2nd Earl Kitchener (5 October 1846 – 27 March 1937), was a British soldier and peer.

Supporting paragraphs: Henry Kitchener, 3rd Earl Kitchener Herbert Kitchener, 1st Earl Kitchener
Answer: Herbert Kitchener, 1st Earl Kitchener