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Baron Inchiquin (pronounced "Inch-i-quin") is one of the older titles in the Peerage of Ireland. It was created in 1543 for Murrough O'Brien, Prince of Thomond, who was descended from the great high king Brian Boru). The grant of the English titles was conditional upon the abandonment of native titles, the adoptation of English customs and laws, the pledging of allegiance to the English crown, apostasy from the Roman Catholic Church, and conversion to the Anglican Church. He was made Earl of Thomond in the Peerage of Ireland, with remainder to his nephew Donough O'Brien. On his death in 1551, he was succeeded in the earldom, according to the special remainder, by his nephew, the second Earl (see Earl of Thomond for later history of this title).
The barony of Inchiquin passed to his son, the second Baron. His great-great-great-grandson, the sixth Baron, was a prominent military commander during the Irish Confederate Wars (1643–48), first for the English Parliament, then as a Royalist commander during the Cromwellian conquest of Ireland (1649–53) during the Wars of the Three Kingdoms. In 1654 he was created Earl of Inchiquin in the Peerage of Ireland. He was succeeded by his son, the second Earl, who served as governor of English Tangier and as Governor of Jamaica. His grandson, the fourth Earl, represented Windsor, Camelford and Aylesbury in the British House of Commons.
He was succeeded by his nephew and son-in-law, the fifth Earl. In 1800, he was created Marquess of Thomond in the Peerage of Ireland, with remainder to his brother the Hon. Edward O'Brien. The following year he was made Baron Thomond, of Taplow in the County of Buckingham, in the Peerage of the United Kingdom, to allow him to sit in the House of Lords, with remainder to the heirs male of his body. He died without male issue in 1808 when the barony of Thomond became extinct. He was succeeded in the marquessate according to the special remainder and in the other Irish titles by his nephew, the second Marquess. He was the third son of the aforementioned the Hon. Edward O'Brien. He was an Irish Representative Peer. In 1826 he was created Baron Tadcaster, of Tadcaster in the County of York, in the Peerage of the United Kingdom. He had no sons and on his death in 1846 the barony of Tadcaster became extinct. He was succeeded in the Irish peerages by his younger brother, the third Marquess. He was an Admiral in the Royal Navy. He also had no sons and on his death in 1855 the marquessate and earldom of Inchiquin became extinct.
However, he was succeeded in the barony of Inchiquin by his distant relative Sir Lucius O'Brien, 5th Baronet, who became the thirteenth Baron (see below for earlier history of the baronetcy). He had earlier represented County Clare in the House of Commons and was later an Irish Representative Peer. He also served as Lord Lieutenant of County Clare. He was succeeded by his son, the fourteenth Baron. He was also an Irish Representative Peer and Lord Lieutenant of County Clare. His son, the fifteenth Baron, also sat in the House of Lords as an Irish Representative Peer. As of 2014[update] the titles are held by his grandson, the eighteenth Baron, who succeeded his uncle in 1982. In the Gaelic nobility Lord Inchiquin is The O'Brien, Chief of the Name, Prince of Thomond.
The O'Brien Baronetcy, of Leaghmenagh in the County of Clare, was created in the Baronetage of Ireland in 1686 for Donough O'Brien, who had earlier represented County Clare in the Irish House of Commons. He was the great-great-grandson and namesake of Donough O'Brien (d. 1582), younger son of the first Earl of Thomond and first Baron Inchiquin. His grandson, the second Baronet, great-grandson, the third Baronet, and great-great-grandson, the fourth Baronet, also represented County Clare in the Irish Parliament, with the fourth Baronet also representing Ennis. The latter was succeeded by his son, the aforementioned fifth Baronet, who in 1855 inherited the barony of Inchiquin.
Barons Inchiquin (1543)
- Murrough O'Brien, 1st Baron Inchiquin (d. 1551).
- Dermod O'Brien, 2nd Baron Inchiquin (d. 1 May 1557)
- Murrough McDermot O'Brien, 3rd Baron Inchiquin (1550–1574)
- Murrough O'Brien, 4th Baron Inchiquin (1563–1597)
- Dermod O'Brien, 5th Baron Inchiquin (1594–1624)
- Murrough O'Brien, 6th Baron Inchiquin (1618–1674) (created Earl of Inchiquin in 1654)
Earls of Inchiquin (1654)
- Murrough O'Brien, 1st Earl of Inchiquin, 6th Baron Inchiquin (1618–1674)
- William O'Brien, 2nd Earl of Inchiquin, 7th Baron Inchiquin (1640–1692)
- William O'Brien, 3rd Earl of Inchiquin, 8th Baron Inchiquin (1662–1719)
- William O'Brien, 4th Earl of Inchiquin, 9th Baron Inchiquin (1700–1777)
- Murrough O'Brien, 5th Earl of Inchiquin, 10th Baron Inchiquin (1726–1808) (created Marquess of Thomond in 1800)
Marquesses of Thomond (1800)
- Murrough O'Brien, 1st Marquess of Thomond, 10th Baron Inchiquin (1726–1808)
- William O'Brien, 2nd Marquess of Thomond, 11th Baron Inchiquin (1765–1846)
- James O'Brien, 3rd Marquess of Thomond, 12th Baron Inchiquin (1768–1855)
Barons Inchiquin (1543; Reverted)
- Lucius O'Brien, 13th Baron Inchiquin (1800–1872)
- Edward Donough O'Brien, 14th Baron Inchiquin (1839–1900)
- Lucius William O'Brien, 15th Baron Inchiquin (1864–1929)
- Donough Edward Foster O'Brien, 16th Baron Inchiquin (1897–1968)
- Pádraig Lucius Ambrose O'Brien, 17th Baron Inchiquin (1900–1982)
- Conor Myles John O'Brien, 18th Baron Inchiquin (b. 1943)
O'Brien Baronets, of Leaghmenagh (1686)
- Sir Donough O'Brien, 1st Baronet (d. 1717)
- Sir Edward O'Brien, 2nd Baronet (d. 1765)
- Sir Lucius O'Brien, 3rd Baronet (d. 1795)
- Sir Edward O'Brien, 4th Baronet (d. 1837)
- Sir Lucius O'Brien, 5th Baronet (1800–1872) (succeeded as Baron Inchiquin in 1855)
see above for further succession
The O'Brien Line of Conor O'Brien, Chief of the Name
There is some overlap with the Barons Inchiquin; those people are marked off in bold.
- Murrough an Taniste O'Brien, d. 1551.
- Donough O'Brien 29 Sep 1582
- Conor O'Brien d. 1603
- Donough O'Brien, d. 1635
- Conor O'Brien, 1617–1651
- Donough O'Brien, 1642–1717
- Lucius O'Brien, 1675–1717
- Edward O'Brien, 1705–1765
- Lucius O'Brien, 1731–1795
- Edward O'Brien, 1773–1837
- Lucius O'Brien, 1800–1872
- Edward O'Brien, 1839–1900
- Lucius O'Brien, 1864–1929
- Fionn O'Brien, 1903–1977
- Conor Myles John O'Brien, b. 1943 (see profile)
Art and culture
- O'Brien dynasty
- Kings of Cashel
- Kings of Desmond
- Kings of Munster
- Kings of Thomond 1119–1543
- Irish Nobility
- Irish Royal Families
- Early Barons Inchiquin
- Earl of Thomond
- The Rt. Hon Thomas Carter M.P. Master of the Rolls Privy Councillor Secretary of State
- Carter-Campbell of Possil
- Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990.
- O'Donoghue, John, Historical Memoir of the O'Briens. Dublin: Hodges, Smith, & Co. 1860.
- Inchiquin, Lucius Lord of (1861) , "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
- Conor O'Brien, 18th Baron Inchiquin
- The O'Brien Clan
- Lundy, Darryl. "www.thePeerage.com". The Peerage.
- Leigh Rayment's Peerage Pages