Cornelius O'Callaghan, 1st Viscount Lismore

Cornelius O'Callaghan, 1st Viscount Lismore PC (I) (2 October 1775 – 30 May 1857) was an Irish Whig[1] politician.

He was the son of Cornelius O'Callaghan, 1st Baron Lismore and Frances Ponsonby. He succeeded to his father's title on 12 July 1797 and assumed his seat in the Irish House of Lords.[2] On 30 May 1806 he was created Viscount Lismore in the Peerage of Ireland.

From 1806 to 1807 he sat in the House of Commons of the United Kingdom as a Member of Parliament (MP) for Lostwithiel, a rotten borough in Cornwall controlled by Lord Mount Edgcumbe.[1]

In 1835 he was made a Member of the Privy Council of Ireland.[2] In 1838 he was made Baron Lismore in the Peerage of the United Kingdom, giving him and his descendants an automatic seat in the British House of Lords. He served as Lord Lieutenant of Tipperary between 20 October 1851 and his death in 1857.

He married Lady Eleanor Butler, daughter of John Butler, 17th Earl of Ormonde and Lady Frances Susan Elizabeth Wandesford, on 11 August 1808. They divorced in 1826. He was succeeded in his title by his third and only surviving son, George O'Callaghan.


  1. Hinton, M. G. (1986). R. Thorne, (ed.). "O'CALLAGHAN, Cornelius, 1st Visct. Lismore [I] (1775-1857), of Shanbally Castle, co. Tipperary". The History of Parliament: the House of Commons 1790–1820. Boydell and Brewer. Retrieved 20 June 2014.CS1 maint: extra punctuation (link)
  2. Debrett's Peerage of the United Kingdom of Great Britain and Ireland, Volume 2 (1825), p.1068 (Retrieved 1 June 2016).
Parliament of the United Kingdom
Preceded by
Hans Sloane
William Dickinson
Member of Parliament for Lostwithiel
With: William Dickinson to January 1807
Charles Cockerell from January 1807
Succeeded by
George Peter Holford
Ebenezer Maitland
Honorary titles
Preceded by
The Earl of Donoughmore
Lord Lieutenant of Tipperary
Succeeded by
The Viscount Lismore
Peerage of Ireland
New creation Viscount Lismore
Succeeded by
George O'Callaghan
Preceded by
Cornelius O'Callaghan
Baron Lismore
Peerage of the United Kingdom
New creation Baron Lismore
Succeeded by
George O'Callaghan

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