Baron Inchiquin
Baron Inchiquin () is one of the older titles in the Peerage of Ireland. It was one of two titles created on 1 July 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 adoption of English customs and laws, pledging of allegiance to the English crown, apostasy from the Catholic Church, and conversion to the Anglican Church. Murrough was made both Earl of Thomond in the Peerage of Ireland, with remainder to his nephew Donough O'Brien and Baron Inchiquin, with remainder to his male heirs.

On his death in 1551, Murrough 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), but the barony of Inchiquin passed to his son Dermod, the second baron. Dermod's 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, William O'Brien, 2nd Earl of Inchiquin, who served as governor of English Tangier and as Governor of Jamaica. His son, William O'Brien, 3rd Earl of Inchiquin, became Governor of Kinsale in 1693. The fourth earl, also named William O'Brien, represented Windsor, Camelford and Aylesbury in the British House of Commons.

The fifth earl, Murrough O'Brien, was the nephew and son-in-law of his predecessor. In 1800, he was created Marquess of Thomond in the Peerage of Ireland, with remainder to his brother, the Honorable Edward Dominic O'Brien, a captain in the British Army. 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 male heirs 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 William O'Brien, 2nd Marquess of Thomond, the third son of the aforementioned Captain Edward O'Brien. The second marquess 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, James O'Brien, 3rd Marquess of Thomond, an admiral in the Royal Navy. He had no sons and on his death in 1855 the marquessate and earldom of Inchiquin became extinct.

In 1855, he was succeeded in the barony of Inchiquin by his distant relative Sir Lucius O'Brien, 5th Baronet, who became the 13th Baron Inchiquin. The O'Brien Baronetcy, of Leaghmenagh in the County of Clare, had been 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 (died 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 fifth baronet.

Before becoming the 13th Baron, the fifth Baronet O'Brien had 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, Edward O'Brien, 14th Baron Inchiquin, also an Irish Representative Peer and Lord Lieutenant of County Clare. His son, Lucius O'Brien, 15th Baron Inchiquin, also sat in the House of Lords as an Irish Representative Peer.

, the titles are held by his grandson, Conor Myles John O'Brien, 18th Baron Inchiquin, born , who succeeded to the title in 1982 from his uncles Donough O'Brien, 16th Baron Inchiquin and Phaedrig O'Brien, 17th Baron Inchiquin.

In the Gaelic nobility, Lord Inchiquin is The O'Brien, Chief of the Name, Prince of Thomond.

The family seat of the O'Brien Baronetcy was Dromoland Castle, near Newmarket-on-Fergus, County Clare. The current Baron Inchiquin lives in Thomond House adjacent to Dromoland.
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Peerage of Ireland
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Murrough O'Brien, Prince of Thomond
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Brian Boru
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Catholic
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Anglican Church
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Earl of Thomond
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Earl of Thomond
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Irish Confederate Wars
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English Parliament
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Cromwellian conquest of Ireland
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Wars of the Three Kingdoms
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William O'Brien, 2nd Earl of Inchiquin
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English Tangier
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Governor of Jamaica
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William O'Brien, 3rd Earl of Inchiquin
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Governor of Kinsale
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William O'Brien
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Windsor
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Camelford
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Aylesbury
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British House of Commons
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Murrough O'Brien
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Edward Dominic O'Brien
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British Army
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Peerage of the United Kingdom
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House of Lords
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William O'Brien, 2nd Marquess of Thomond
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Irish Representative Peer
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James O'Brien, 3rd Marquess of Thomond
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admiral
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Royal Navy
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Lucius O'Brien, 5th Baronet
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Baronetage of Ireland
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County Clare
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Irish House of Commons
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Ennis
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County Clare
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Lord Lieutenant of County Clare
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Edward O'Brien, 14th Baron Inchiquin
PER
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Lucius O'Brien, 15th Baron Inchiquin
PER
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Conor Myles John O'Brien, 18th Baron Inchiquin
PER
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Donough O'Brien, 16th Baron Inchiquin
PER
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Phaedrig O'Brien, 17th Baron Inchiquin
PER
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Gaelic nobility
Concept
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Dromoland Castle
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Newmarket-on-Fergus
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County Clare
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Baron Inchiquin
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Baron Inchiquin
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Baron Inchiquin
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Baron Inchiquin
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Baron Inchiquin
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Baron Inchiquin
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Baron Inchiquin
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Q4862513
Baron Inchiquin
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Baron Inchiquin
PER
Q4862513
Baron Inchiquin
PER
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military branch
noble title
location
located in the administrative territorial entity