Biography
Henry Dillon, 11th Viscount Dillon of Costello-Gallin, was born 1705 in Quarrendon, Buckinghamshire, England, United Kingdom to Arthur Dillon (1670-1732) and Christina Sheldon (1684-1757) and died 3 September 1787 Saint-Germain-en-Laye, Île-de-France, France of unspecified causes. He married Charlotte Lee (1720-1794) 26 October 1744 in Portuguese Embassy, London, Greater London, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Charles Dillon-Lee, 12th Viscount Dillon (1745-1813) | 6 November 1745 London, Greater London, England, United Kingdom | 9 November 1813 Loughlin House, County Roscommon, Ireland | Henrietta Maria Phipps (1757-1782) Maria Rogier (-1833) |
| Frances Dillon (1747-1825) | 1747 | 1 March 1825 London, Greater London, England, United Kingdom | William Jerningham, 6th Bart (1736-1809) |
| Arthur Dillon (1750-1794) | |||
| Charlotte Dillon (1755-1782) | |||
| Henry Dillon (1759-1837) | |||