Dermod O'Brien, 5th Baron Inchiquin

Dermod, who was born in October 1594, was the son of Murrough O'Brien, 4th Baron Inchiquin (1562 – 24 July 1597), the son of Murrough McDermot O'Brien, 3rd Baron Inchiquin and Mabel Nugent, daughter of Christopher Nugent, 6th Baron Delvin.[2] He inherited the barony at the age of two.

Dermod O'Brien married Ellen, eldest daughter of Sir Edmund FitzJohn FitzGerald of Cloyne and Ballymaloe House in County Cork,[2] from that powerful Hiberno-Norman family. They had four sons,[3][lower-alpha 1] and several daughters:

• Murrough, 6th Baron Inchiquin, their eldest son, became the first Earl of Inchiquin.[2][6]
• Henry (d. 1645),[2] a lieutenant colonel in the army of King Charles I.[4][3]
• Christopher (died 1664),[2] a lieutenant-colonel in the Irish Confederate Army, who was created "Baron of Inchiquin," by the Supreme Council of the Catholic Confederation.[4] He never married.[3]
• Murtough O'Brien, who led a guerrilla campaign against Cromwell's generals in the Burren. He later obtained a pardon and emigrated to Spain where he became a general in the Spanish army
• Honora,[7] who married Anthony Stoughton of Rattoo, County Kerry.[4]
• Mary,[1] married Michael Boyle, Archbishop of Armagh, and Lord Chancellor of Ireland, and had with him numerous children, including Murrough Boyle, 1st Viscount Blesington, and Eleanor (who became the wife of the William Hill of Hillsborough, M.P.,[8] and mother to Michael Hill (1672–1699) M.P.) through whom Lord Inchiquin became an ancestor of Elizabeth II.
• Ann, died unmarried[4]

• Early Barons Inchiquin
• Baron Inchiquin
• O'Brien Pedigree

• The Anglo-American Magazine, Toronto: Maclear, 1: 506, July–December 1852 Missing or empty |title= (help)
• Bagwell, Richard (1888), "O'Brien, Murrough (1614-1674)" , in Stephen, Leslie (ed.), Dictionary of National Biography, 16, London: Smith, Elder & Co, pp. 320–327
• Inchiquin, Lucius Lord of (1861) [1765], "The Petition of the right Honourable Lucius Baron of Inchiquin (otherwise Inskwyne), of that part of the United Kingdom of Great Britain and Ireland called Ireland.", Case of the Right Honourable Lucius, lord Inchiquin in the peerage of Ireland on his claiming the right to vote at the election of representative peers for Ireland. ..., pp. 66–70
• Lundy, Darryl (22 October 2012), Dermot O'Brien, 5th Baron of Inchiquin, thepeerage.com, p. 10284 § 102833, retrieved October 2013 Check date values in: |access-date= (help) Endnotes:
  • Cokayne, G.E. (2000), Vicary Gibbs; H.A. Doubleday; Geoffrey H. White; Duncan Warrand; Howard de Walden (eds.), The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, 1 (nee, 1910–1959; reprint in 6 volumes ed.), Gloucester, UK: Alan Sutton Publishing, p. 193
  • Mosley, Charles, ed. (2003), Burke's Peerage, Baronetage & Knightage, 1 (107th, 3 volumes ed.), Wilmington, Delaware, USA: Burke's Peerage, p. 400
  • Mosley, Charles, ed. (2003), Burke's Peerage, Baronetage & Knightage, 2 (107th, 3 volumes ed.), Wilmington, Delaware, USA: Burke's Peerage, p. 2035
• O'Hart, John (2007), The Irish And Anglo-Irish Landed Gentry, When Cromwell Came to Ireland: Or, a Supplement to Irish Pedigrees (reprint ed.), Heritage Books, p. 129, ISBN 9780788419270