Paternal Family Tree: Cavendish
Maternal Family Tree: Elizabeth Milbanke Viscountess Melbourne 1751-1818
William Cavendish educated at Trinity College, Cambridge University [Map].
William Cavendish educated at Eton College [Map].
In 1917 [his father] Edward William Spencer Cavendish 10th Duke Devonshire [aged 21] and [his mother] Mary Alice Gascoyne-Cecil Duchess Devonshire [aged 21] were married. She the daughter of [his grandfather] James Gascoyne-Cecil 4th Marquess Salisbury [aged 55] and [his grandmother] Cicely Anne Gore Marchioness Salisbury [aged 49]. He the son of Victor Christian William Cavendish 9th Duke Devonshire [aged 48] and Evelyn Emily Mary Petty-Fitzmaurice Duchess Devonshire [aged 46].
On 10th December 1917 William Cavendish was born to Edward William Spencer Cavendish 10th Duke Devonshire [aged 22] and Mary Alice Gascoyne-Cecil Duchess Devonshire [aged 22].
On 6th May 1938 [his grandfather] Victor Christian William Cavendish 9th Duke Devonshire [aged 69] died at Chatsworth House, Derbyshire [Map]. He was buried at Cavendish Plot, St Peter's Church, Edensor [Map]. His son [his father] Edward [aged 43] succeeded 10th Duke Devonshire, 13th Earl Devonshire, 5th Earl Burlington, 13th Baron Cavendish Hardwick. [his mother] Mary Alice Gascoyne-Cecil Duchess Devonshire [aged 42] by marriage Duchess Devonshire. On 2nd April 1960 [his grandmother] Evelyn Emily Mary Petty-Fitzmaurice Duchess Devonshire [aged 67] died. Both the Duke and Duchess were buried in the Cavendish Plot, St Peter's Church, Edensor [Map].
Evelyn Emily Mary Petty-Fitzmaurice Duchess Devonshire: On 27th August 1870 she was born to Henry Petty-Fitzmaurice 5th Marquess Lansdowne. On 30th July 1892 Victor Christian William Cavendish 9th Duke Devonshire and she were married. She by marriage Duchess Devonshire. She the daughter of Henry Petty-Fitzmaurice 5th Marquess Lansdowne. They were fifth cousins.
On 19th April 1941 [his brother] Andrew Cavendish 11th Duke Devonshire [aged 21] and [his sister-in-law] Deborah Mitford [aged 21] were married. He the son of [his father] Edward William Spencer Cavendish 10th Duke Devonshire [aged 45] and [his mother] Mary Alice Gascoyne-Cecil Duchess Devonshire [aged 45].
At the commencement of their honeymoon Deborah 'stopped the car ... and registered at a small Labour Exchange for National Service,' as per The Sketch.
On 6th May 1944 William Cavendish [aged 26] and Kathleen "Kick" Kennedy [aged 24] were married at Chelsea Register Office. She the daughter of Joseph Patrick Kennedy [aged 55] and Rose Elizabeth Fitzgerald [aged 53]. He the son of Edward William Spencer Cavendish 10th Duke Devonshire [aged 49] and Mary Alice Gascoyne-Cecil Duchess Devonshire [aged 48].
The Duke of Devonshire and the bride's eldest brother Joseph P. Kennedy Jr [aged 28], a lieutenant in the United States Navy, signed the marriage register. The Duke of Rutland [aged 24] served as best man.
The photos, from left to right, Mary, Duchess of Devonshire, the groom William, Marquess of Hartington, the bride Kathleen Kennedy, Joseph Kennedy, Edward, 10th Duke of Devonshire.
Kathleen "Kick" Kennedy: On 20th February 1920 she was born to Joseph Patrick Kennedy and Rose Elizabeth Fitzgerald at Brookline Massachusetts. On 13th May 1948 Kathleen "Kick" Kennedy and William Henry Lawrence Peter Wentworth-Fitzwilliam 8th and 6th Earl Fitzwilliam died in a plane crash at the Plateau du Coiron, Saint-Bauzile during the course of their journey from Paris [Map] to the French Riviera for a vacation aboard a de Havilland DH.104 Dove. His first cousin once removed Eric succeeded 9th Earl Fitzwilliam, 7th Earl Fitzwilliam, 11th Baron Fitzwilliam of Liffer in Donegal. His wealth, estimated at 45 million pounds, including half of the Wentworth Woodhouse estate, the Coolattin estate in County Wicklow, Ireland, and a large part of the Fitzwilliam art collection went to his daughter Ann Juliet Dorothea Maud Wentworth-Fitzwilliam Marchioness Bristol.
Joseph Patrick Kennedy: On 25th July 1915 he was born to Joseph Patrick Kennedy and Rose Elizabeth Fitzgerald. On 12th August 1944 Joseph Patrick Kennedy was killed at Blythburgh, Suffolk when his plane exploded over the English Channel during a top-secret mission.
On 9th September 1944 William Cavendish [aged 26] was killed in action by a sniper whilst leading a company trying to capture the town of Heppen in Belgium. He was buried at the Leopoldsburg War Cemetery.
After 1945. Holy Trinity Church, Ashford-in-the-Water [Map]. Memorial to William Cavendish, Sampson Lynes Gratton and Robert Harris. And War Memorial for the First World War.
After 1945. St Peter's Church, Edensor [Map]. Memorial to those who fell in the Second World War including William Cavendish, heir to the Duke of Devonshire.
Annals of the six Kings of England by Nicholas Trivet
Translation of the Annals of the Six Kings of England by that traces the rise and rule of the Angevin aka Plantagenet dynasty from the mid-12th to early 14th century. Written by the Dominican scholar Nicholas Trivet, the work offers a vivid account of English history from the reign of King Stephen through to the death of King Edward I, blending political narrative with moral reflection. Covering the reigns of six monarchs—from Stephen to Edward I—the chronicle explores royal authority, rebellion, war, and the shifting balance between crown, church, and nobility. Trivet provides detailed insight into defining moments such as baronial conflicts, Anglo-French rivalry, and the consolidation of royal power under Edward I, whose reign he describes with particular immediacy. The Annals combines careful year-by-year reporting with thoughtful interpretation, presenting history not merely as a sequence of events but as a moral and political lesson. Ideal for readers interested in medieval history, kingship, and the origins of the English state, this chronicle remains a valuable and accessible window into the turbulent world of the Plantagenet kings.
Available at Amazon in eBook and Paperback format.
On 13th May 1948 [his former wife] Kathleen "Kick" Kennedy [aged 28] and William Henry Lawrence Peter Wentworth-Fitzwilliam 8th and 6th Earl Fitzwilliam [aged 37] died in a plane crash at the Plateau du Coiron, Saint-Bauzile during the course of their journey from Paris [Map] to the French Riviera for a vacation aboard a de Havilland DH.104 Dove. His first cousin once removed Eric [aged 64] succeeded 9th Earl Fitzwilliam, 7th Earl Fitzwilliam, 11th Baron Fitzwilliam of Liffer in Donegal. His wealth, estimated at 45 million pounds, including half of the Wentworth Woodhouse estate, the Coolattin estate in County Wicklow, Ireland, and a large part of the Fitzwilliam art collection went to his daughter Ann Juliet Dorothea Maud Wentworth-Fitzwilliam Marchioness Bristol [aged 13].
Kings Wessex: Great x 24 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 21 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 25 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 22 Grand Son of Maredudd ap Bleddyn King Powys
Kings Godwinson: Great x 25 Grand Son of King Harold II of England
Kings England: Great x 14 Grand Son of King Edward IV of England
Kings Scotland: Great x 19 Grand Son of King Robert II of Scotland
Kings France: Great x 17 Grand Son of King Philip IV of France
Kings Duke Aquitaine: Great x 28 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Great x 21 Grand Son of Alfonso VII King Castile VII King Leon
Great x 4 Grandfather: George Augustus Henry Cavendish 1st Earl Burlington 
8 x Great Grandson of King Henry VII of England and Ireland
Great x 3 Grandfather: William Cavendish 9 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandmother: Elizabeth Compton Countess Burlington 
12 x Great Granddaughter of King Edward III of England
Great x 2 Grandfather: William Cavendish 7th Duke Devonshire 10 x Great Grandson of King Henry VII of England and Ireland
Great x 3 Grandmother: Louisa O'Callaghan
Great x 1 Grandfather: Edward Cavendish 11 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandfather: Frederick Howard 5th Earl Carlisle 
11 x Great Grandson of King Edward III of England
Great x 3 Grandfather: George Howard 6th Earl Carlisle 9 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandmother: Margaret Caroline Leveson-Gower Countess Carlisle 8 x Great Granddaughter of King Henry VII of England and Ireland
Great x 2 Grandmother: Blanche Georgiana Howard 10 x Great Granddaughter of King Henry VII of England and Ireland
Great x 4 Grandfather: William Cavendish 5th Duke Devonshire 8 x Great Grandson of King Henry VII of England and Ireland
Great x 3 Grandmother: Georgiana Cavendish Countess Carlisle 9 x Great Granddaughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Georgiana Spencer Duchess Devonshire 
10 x Great Granddaughter of King Henry VII of England and Ireland
Grandfather: Victor Christian William Cavendish 9th Duke Devonshire 12 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandfather: Edward Lascelles 1st Earl Harewood 
Great x 3 Grandfather: Henry Lascelles 2nd Earl Harewood
Great x 4 Grandmother: Anne Chaloner Baroness Harewood
Great x 2 Grandfather: William Lascelles
Great x 3 Grandmother: Henrietta Sebright Countess Harewood
Great x 1 Grandmother: Emma Elizabeth Lascelles 11 x Great Granddaughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Frederick Howard 5th Earl Carlisle 11 x Great Grandson of King Edward III of England
Great x 3 Grandfather: George Howard 6th Earl Carlisle 9 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandmother: Margaret Caroline Leveson-Gower Countess Carlisle 8 x Great Granddaughter of King Henry VII of England and Ireland
Great x 2 Grandmother: Caroline Georgiana Howard 10 x Great Granddaughter of King Henry VII of England and Ireland
Great x 4 Grandfather: William Cavendish 5th Duke Devonshire 8 x Great Grandson of King Henry VII of England and Ireland
Great x 3 Grandmother: Georgiana Cavendish Countess Carlisle 9 x Great Granddaughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Georgiana Spencer Duchess Devonshire 10 x Great Granddaughter of King Henry VII of England and Ireland
father: Edward William Spencer Cavendish 10th Duke Devonshire 13 x Great Grandson of King Henry VII of England and Ireland
Great x 4 Grandfather: William Petty 1st Marquess Lansdowne
Great x 3 Grandfather: Henry Petty-Fitzmaurice 3rd Marquess Lansdowne 12 x Great Grandson of King Edward III of England
Great x 4 Grandmother: Louisa Fitzpatrick Marchioness Lansdowne 11 x Great Granddaughter of King Edward III of England
Great x 2 Grandfather: Henry Thomas Petty-Fitzmaurice 4th Marquess Lansdowne 13 x Great Grandson of King Edward III of England
Great x 4 Grandfather: Henry Thomas Fox-Strangways 2nd Earl of Ilchester 
12 x Great Grandson of King Edward III of England
Great x 3 Grandmother: Louisa Emma Fox-Strangways Marchioness of Lansdowne 13 x Great Granddaughter of King Edward III of England
Great x 4 Grandmother: Mary Theresa O'Grady Countess of Ilchester
Great x 1 Grandfather: Henry Petty-Fitzmaurice 5th Marquess Lansdowne 14 x Great Grandson of King Edward III of England
Great x 3 Grandfather: Charles Joseph Comte de Flahaut
Great x 2 Grandmother: Emily Jane de Flahaut Marchioness Lansdowne 15 x Great Granddaughter of King Robert II of Scotland
Great x 4 Grandfather: George Keith Elphinstone 1st Viscount Keith 13 x Great Grandson of King Robert II of Scotland
Great x 3 Grandmother: Margaret Mercer Elphinstone Countess Flahaut and 2nd Baroness Keith 14 x Great Granddaughter of King Robert II of Scotland
Great x 4 Grandmother: Jane Mercer
Grandmother: Evelyn Emily Mary Petty-Fitzmaurice Duchess Devonshire 15 x Great Granddaughter of King Edward III of England
William Cavendish 14 x Great Grandson of King Edward IV of England
Great x 4 Grandfather: James Cecil 6th Earl of Salisbury 
8 x Great Grandson of King Edward IV of England
Great x 3 Grandfather: James Cecil 1st Marquess Salisbury 9 x Great Grandson of King Edward IV of England
Great x 4 Grandmother: Elizabeth Keet Countess of Salisbury
Great x 2 Grandfather: James Brownlow William Gascoyne-Cecil 2nd Marquess Salisbury 10 x Great Grandson of King Edward IV of England
Great x 4 Grandfather: Wills Hill 1st Marquess Downshire
Great x 3 Grandmother: Mary Amelia Hill Marchioness Salisbury 10 x Great Granddaughter of King Edward III of England
Great x 4 Grandmother: Margaretta Fitzgerald 
9 x Great Granddaughter of King Edward III of England
Great x 1 Grandfather: Robert Gascoyne-Cecil 3rd Marquess Salisbury 11 x Great Grandson of King Edward IV of England
Great x 4 Grandfather: Bamber Gascoigne "The Elder"
Great x 3 Grandfather: Bamber "The Younger" Gascoyne
Great x 4 Grandmother: Mary Green
Great x 2 Grandmother: Frances Mary Gascoyne Marchioness Salisbury
Great x 4 Grandfather: Chase Price
Great x 3 Grandmother: Sarah Bridget Frances Price
Great x 4 Grandmother: Susan Evelyn
Grandfather: James Gascoyne-Cecil 4th Marquess Salisbury 12 x Great Grandson of King Edward IV of England
Great x 1 Grandmother: Georgina Alderson Marchioness of Salisbury
mother: Mary Alice Gascoyne-Cecil Duchess Devonshire 13 x Great Granddaughter of King Edward IV of England
Great x 4 Grandfather: Arthur Saunders Gore 2nd Earl Arran 13 x Great Grandson of King Edward III of England
Great x 3 Grandfather: William John Gore 12 x Great Grandson of King Edward III of England
Great x 4 Grandmother: Catherine Annesley 11 x Great Granddaughter of King Edward III of England
Great x 2 Grandfather: Philip Gore 4th Earl Arran 13 x Great Grandson of King Edward III of England
Great x 4 Grandfather: Thomas Hales 4th Baronet 18 x Great Grandson of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Caroline Hales 19 x Great Granddaughter of King Henry "Curtmantle" II of England
Great x 1 Grandfather: Arthur Saunders Gore 5th Earl Arran 14 x Great Grandson of King Edward III of England
Great x 3 Grandfather: William Francis Patrick Napier
Great x 2 Grandmother: Elizabeth Marianne Napier Countess Arran
Grandmother: Cicely Anne Gore Marchioness Salisbury 13 x Great Granddaughter of King Henry IV of England
Great x 4 Grandfather: Robert Jocelyn 2nd Earl Roden 12 x Great Grandson of King Edward III of England
Great x 3 Grandfather: Robert Jocelyn 3rd Earl Roden 13 x Great Grandson of King Edward III of England
Great x 2 Grandfather: Robert Jocelyn 11 x Great Grandson of King Henry IV of England
Great x 4 Grandfather: Thomas Stapleton 12th Baron Despencer 
9 x Great Grandson of King Henry IV of England
Great x 3 Grandmother: Maria Frances Catherine Stapleton Countess Roden 10 x Great Granddaughter of King Henry IV of England
Great x 4 Grandmother: Elizabeth Eliot Baroness Despencer
Great x 1 Grandmother: Edith Jocelyn 12 x Great Granddaughter of King Henry IV of England
Great x 4 Grandfather: George Nassau Clavering-Cowper 3rd Earl Cowper 13 x Great Grandson of King Edward III of England
Great x 3 Grandfather: Peter Nassau Clavering-Cowper 5th Earl Cowper 14 x Great Grandson of King Edward III of England
Great x 4 Grandmother: Hannah Anna Gore 3rd Countess Cowper
Great x 2 Grandmother: Frances Elizabeth Cowper 14 x Great Granddaughter of King Edward III of England
Great x 4 Grandfather: Penistone Lamb 1st Viscount Melbourne
Great x 3 Grandmother: Emily Lamb Countess Cowper 13 x Great Granddaughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Milbanke Viscountess Melbourne 12 x Great Granddaughter of King Edward III of England