Murrough O'Brien, 1st Marquess of Thomond

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Murrough O'Brien, 1st Marquess of Thomond KP PC (172617 February 1808), known from 1777 to 1800 as the 5th Earl of Inchiquin, was an Irish peer.

He joined the Grenadier Guards and was an officer in Germany, where he carried colours at the Battle of Lauffeld in 1747. He retired in 1756.

On 29 December 1800 he was created Marquess of Thomond in the Peerage of Ireland, with a special remainder to his younger brother, and Baron Thomond of Taplow in the Peerage of the United Kingdom on 2 October 1801, but this time with no special remainder. He had a close relationship with King George III. In 1783 he was one of the Founding Knights of the Order of St Patrick. Despite his support of the Act of Union of Great Britain and Ireland, he was not made a representative peer of Ireland. His Irish seat was Rostellan, near Cork.

He was a drinker, called a "'six bottle man", and a gambler. He had a zest for life. He was a keen farmer and oversaw enclosure of lands around Taplow and mechanisation.

He married Mary O'Brien, 3rd Countess of Orkney (d.1790) in 1753, with whom he had a daughter, Mary O'Brien, 4th Countess of Orkney (b.1755). He also is reputed to have had an illegitimate son, Thomas Carter (1768-1800), who was a popular singer in London during the 1790s. Thomas lived with Inchiquin at Taplow Court after his return from India around 1788, and lent the earl all the money he earned in a benefit concert in Calcutta. In return, Inchiquin recommended Thomas to all his friends as a coal merchant; he had gone into that field after his marriage to Mary Wells in 1793 in order to support his growing family).

Then in 1792, he married Mary Palmer, the niece and a beneficiary of Joshua Reynolds (painter). She paid his debts.

He died after a fall from his horse in Grosvenor Square, London on 10 February 1808). The barony of Thomond became extinct on his death.

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Parliament of Ireland
Preceded by
John Graydon
and Agmondisham Vesey
Member of Parliament for Harristown
(two seat constituency)
with Edward Sandford

1761–1768
Succeeded by
Garret FitzGerald
and Robert Graydon
Parliament of Great Britain
Preceded by
George Fitzwilliam and
Marquess of Graham
Member of Parliament for Richmond, North Yorkshire
(with Charles Dundas, to 1786;
Sir Grey Cooper, 1786–1790;
Lawrence Dundas, from 1790)

1784–1796
Succeeded by
Lawrence Dundas and
Charles George Beauclerk
Peerage of Ireland
Preceded by
New Creation
Marquess of Thomond
1800–1808
Succeeded by
William O'Brien
Preceded by
William O'Brien
Earl of Inchiquin
1777–1808
Peerage of the United Kingdom
Preceded by
New Creation
Baron Thomond
1801–1808
Succeeded by
Title Extinct