O'Callaghan, Cornelius, 1st Viscount Lismore (1772 -1857)
Cornelius O’Callaghan was born 2 October 1772, the son of Cornelius Lismore, 1st Lord Lismore of Shanbally Castle, Cogheen, County Tipperary, and Francis Ponsonby, second daughter of the Right Honourable John Ponsonby, Speaker of the Irish Parliament. He succeeded his father as Lord Lismore 12 July 1797, and was created Viscount Lismore in 1806. He was a Privy Councillor for Ireland in 1835, and was created Baron Lismore of the United Kingdom in 1838, in which title he sat in the House of Lords. He married Eleanor the second daughter of the Earl of Ormonde 11 August 1808, but the marriage was dissolved in 1826, and she died in 1837. He died in 1857 and was succeeded by his only surviving son George Ponsonby O’Callaghan, 2nd Viscount.