3rd Duke of Devonshire

William Cavendish, 4th Duke of Devonshire, born 1720,
Lord-Lieutenant of Ireland 1755-6,
Prime Minister 1756-7,
mar Charlotte Boyle [descendant of Henry VII] and had issue:

1. William Cavendish, 5th Duke of Devonshire,
   mar Georgina Spencer [see biography, descendant of Edward III]
   and had issue:
   1. Georgina Cavendish, had issue:
      1. Blanche Howard, mar William Cavendish, 7th Duke of Devonshire and had issue.

2. George Cavendish, had issue:
   1. William Cavendish, had issue:
      1. William Cavendish, 7th Duke of Devonshire,
         founded Cavendish Laboratory, Cambridge, 1871,
         named in honour of his relation the physicist Cavendish,
         mar Blanche Howard and had issue:
         1. Lord Frederick Cavendish (see here), born 1836,
            Chief Secretary for Ireland 1882,
            murdered in Phoenix Park, Dublin, 1882.

   
   

3. Dorothy Cavendish, ancestor of Elizabeth II.

• Cavendish Row, Dublin (top of O'Connell St at Parnell Square) is after the 3rd Duke.
• The old Cavendish Laboratory was in the early 20th cent. the scene of the discovery of the structure of the atom, and then in mid-20th cent. the scene of the discovery of the structure of DNA. Cambridge's Physics department has since moved to a new Cavendish Laboratory in West Cambridge.

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