Biography
Cornelius O'Callaghan, 1st Baron Lismore of Shanbally, was born 7 January 1741 to Thomas O'Callaghan (1713-) and Sarah Davis (c1719-1745) and died 12 July 1797 of unspecified causes. He married Frances Ponsonby (1757-1827) 13 December 1774 .
Children
| Name | Birth | Death | Joined with |
| Elizabeth O'Callaghan (-1824) | |||
| Mary O'Callaghan (-) | |||
| Cornelius O'Callaghan, 1st Viscount Lismore (1775-1857) | |||
| Robert William O'Callaghan (1777-1849) | |||
| Louisa O'Callaghan (1779-1863) | 5 August 1779 | 18 April 1863 Chislehurst, Greater London, England, United Kingdom | William Cavendish (1783-1812) |
| George O'Callaghan (1787-1856) | |||
Footnotes (including sources)
| ‡ General |