Findings:

• William John Cavendish-Scott-Bentinck, 5th Duke of Portland
• William de la Pole, 1st Duke of Suffolk
• Arthur William Saxe-Coburg-Gotha, Duke of Connaught
• William Augustus Hanover, Duke of Cumberland
• William Henry Cavendish-Bentinck, 3rd Duke of Portland
• William Douglas, 4th Duke of Queensberry
• William Cavendish, 4th Duke of Devonshire
• Le Prince d Aquitaine la tour abolie
• Eleanor of Aquitaine
• Aquitaine
• Prosper of Aquitaine
• dukes (user)
• Duke University
• Duke Nukem
• David Duke
• Raoul Duke
• The Grand Old Duke Of York
• Duke Ellington
• Iron Duke
• Duke Leto Atreides
• Duke of Lancaster
• The Duke
• duke
• The Dukes of Hazzard
• Thin White Duke
• Duke University Medical Center
• Duke in
• Duke it out
• Daisy Dukes
• Duke of Prunes
• Duke of Edinburgh
• Duke Nukem 3D
• How to write an episode of Dukes of Hazzard
• Duke of York
• Amboy Dukes
• Catherine Duke
• Uncle Duke
• Duke Class Frigate
• Duke Nukem Forever
• Duke Aelric
• Duke of Wellington
• Duke muffin man (user)
• the Patty Duke Show theme
• Duke Leto (user)
• Duke of Edinburgh's Award
• Grand Duke Michael of Russia
• Duke of Cornwall
• Luke Duke
• Bo Duke
• Edmund Duke
• The Duke of York's Release to John Lord Berkeley, and Sir George Carteret
• Dukes of Stratosphear
• 13th Duke Of Wimborne
• Duke Snider
• Duke Kahanamoku
• Humphry Duke of Gloucester
• Duke of Suffolk
• Duke of Newcastle
• Duke of Marlborough
• What The Dukes of Hazzard and Mystikal have in common
• The disaffections of the Duke of Warwick
• Duke of Alva
• Alexander Farnese, Duke of Parma
• Duke of Windsor
• the thin white duke (user)
• The Grand Duke
• Duke Phillips
• Raoul Duke (user)
• Francis, Duke of Guise
• The Duke of Uranium
• Dukes of Normandy
• Duke of Gloucester
• Duke Bluebeard's Castle
• Grand Duke
• the duke (user)
• Andrew Duke
• Duke of Kent
• Duke of Norfolk
• Richard, Duke of York
• Duke of Clarence
• Duke of Warwick
• Duke of Buckingham
• Duke of Albemarle
• George, Duke of Clarence
• Duke of Hereford
• Duke of Devonshire
• Duke of Northumberland
• John, Duke of Bedford
• Frederick Augustus Hanover, Duke of York
• Duke of York's Column
• Duke of Earl
• Ramsey Dukes (user)
• George Edward Windsor, 1st Duke of Kent
• Humphrey, Duke of Gloucester
• Duke of Brittany
• Thomas Mowbray, 1st Duke of Norfolk
• Duke of Albany
• Duke of Somerset
• Duke of Ireland
• Duke of Portland
• Duke of Burgundy
• Duke of Lower Lorraine
• Duke of Brabant
• Duke of Mar
• Duke of Connaught
• Duke of Fife
• Duke of Richmond
• Duke of Hamilton
• Duke University Press
• Thomas, Duke of Clarence
• Duke of Brandon
• John Mowbray, 4th Duke of Norfolk
• The Duchess of Duke Street
• Archibald Douglas, Duke of Douglas
• Duke of Châtelherault
• Duke of Rothesay
• Robert Stewart, 1st Duke of Albany
• Charles Edward, 2nd Duke of Albany
• Leopold George, 1st Duke of Albany
• John Mowbray, 2nd Duke of Norfolk
• James Butler, 2nd Duke of Ormonde
• Duke of Ormonde
• Duke of Rutland
• Duke of Bolton
• Duke of Monmouth
• John Stewart, 2nd Duke of Albany
• Duke of Orleans
• George Villiers, 1st Duke of Buckingham
• Duke of Southampton
• Duke of St Albans
• Duke of Buccleuch
• Duke of Grafton
• Duke of Lennox
• John Churchill, 1st Duke of Marlborough
• Henry Fitzroy, Duke of Richmond
• Thomas Howard, 3rd Duke of Norfolk
• Duke of Queensberry
• Duke of Exeter
• Henry Fitzroy, 1st Duke of Grafton
• Duke of Ross
• Grand Duke of Luxembourg
• Duke of Luxemburg
• Augustus Henry Fitzroy, 3rd Duke of Grafton
• James Scott, Duke of Monmouth
• Duke of Queensbury
• Duke of Westminster
• John Howard, 1st Duke of Norfolk
• Thomas Howard, 2nd Duke of Norfolk
• Angus Montagu, 12th Duke of Manchester
• Duke of Manchester
• Duke of Austria
• Thomas Pelham Holles, 1st Duke of Newcastle
• Duke of Cumberland
• Duke of Kendal
• Henry Pelham Pelham-Clinton, 5th Duke of Newcastle
• Duke of Argyll
• James Hamilton, 1st Duke of Hamilton
• Duke of Wharton
• Alfred Ernest Albert, Duke of Edinburgh
• George Neville, Duke of Bedford
• Duke of Bedford
• Duke of Kingston
• John Russell, 4th Duke of Bedford
• Wriothesley Russell, 2nd Duke of Bedford
• Francis Russell, 5th Duke of Bedford
• Henry Stafford, 2nd Duke of Buckingham
• John Holles, Duke of Newcastle
• Christopher Monck, 2nd Duke of Albemarle
• Albert, Duke of Clarence
• Francis Egerton, 3rd Duke of Bridgewater
• Duke of Bridgewater
• Charles Seymour, 6th Duke of Somerset
• Edward Adolphus St Maur, 12th Duke of Somerset
• Edmund Beaufort, 1st Duke of Somerset
• Duke of Cleveland
• John Beaufort, Duke of Somerset
• Charles Stuart, Duke of Kendal
• Augustus Frederick Hanover, Duke of Sussex
• Duke of Sussex
• Henry Robin Russell, 14th Duke of Bedford
• John Ian Russell, 13th Duke of Bedford
• Duke of Gordon
• George Gordon, 5th Duke of Gordon
• Edward Seymour, 1st Duke of Somerset
• Scroop Egerton, 1st Duke of Bridgewater
• David Stewart, Duke of Rothesay
• Duke of Douglas
• Duke of Beaufort
• Arthur Wellesley, 1st Duke of Wellington

If you Log in you could create a "William IX, Duke of Aquitaine" node. If you don't already have an account, you can register here.