Charles O'Brien, 6th Viscount Clare

Charles O'Brien, (17 March 1699 – 9 September 1761), 6th Viscount Clare (titular 9th Earl of Thomond) was an Irish military officer in French service, known to posterity as the Maréchal de Thomond.

Charles O'Brien was the son of Charles O'Brien, 5th Viscount Clare and Charlotte Bulkeley, the sister of Anne, second wife of James FitzJames, 1st Duke of Berwick and Marshal of France. He fought for France against Spain in 1718 with the rank of colonel in the service of his father's regiment and later fought in the War of the Polish Succession in the Siege of Philippsburg in June 1734, where he was wounded. He gained the rank of Maréchal de Camp in 1735 in the service of the King's Armies. O'Brien also fought in the Battle of Dettingen in 1743 and in the Battle of Fontenoy in 1745.

O'Brien was invested as a Knight, L'Ordre du Saint-Esprit of France on 2 February 1746 at the chapel of Versailles, Île-de-France, France. He held the office of Governor of Neuf-Brisach in Alsace, and was Commander-in-Chief of the province of Languedoc. In 1757 he was made a Marshal of France. He died on 9 September 1761, aged 62, at Montpelier, France.

O'Brien married Marie Genevieve Louise Gautier, daughter of François Gautier, marquis de Chiffreville, in 1755 and had three children:

Charles O'Brien, 7th Viscount Clare
Antoinette Charlotte Marie Septimanie O'Brien (1759-1808), married Antoine César de Choiseul Praslin, duc de Praslin.

Peerage of Ireland
Preceded by Charles O'Brien	— TITULAR — Viscount Clare Jacobite Peerage 1699-1761	Succeeded by Charles O'Brien
Preceded by Henry O'Brien	— TITULAR — Earl of Thomond Jacobite Peerage 1741–1761	Succeeded by Charles O'Brien

Ó Briain
General	High Kings of Ireland Kings of Munster Kings of Thomond Kings of Dublin Kings of Mann and the Isles Earl of Thomond Viscount Clare Baron Inchiquin O'Brien baronets Clare's Dragoons Composition of Thomond
Ó Briain	Brian Bóruma Donnchad mac Briain Tadc mac Briain Murchad mac Donnchada Toirdhealbhach Ua Briain Muircheartach Ua Briain Domnall mac Taidc Domnall Gerrlámhach Diarmait Ua Briain Conchobar Ua Briain Bé Binn Ní Briain Brian Ua Briain Toirdelbhach mac Diarmaida Ó Briain Muircheartach mac Toirdelbhach Ó Briain Domhnall Mór Ó Briain Muircheartach Finn Ó Briain Conchobhar Ruadh Ó Briain Donnchadh Cairprech Ó Briain Conchobhar na Suidaine Ó Briain
Ó Briain Clann Brian Ruadh	Brian Ruadh Ó Briain Donnchadh mac Brian Ruadh Ó Briain Diarmuid Cléirech Ó Briain Donnchadh mac Domhnall Ó Briain Brian Bán Ó Briain
Ó Briain Clann Tadhg	Tadhg Cael Uisce Ó Briain Toirdelbach Ó Briain Donnchadh mac Toirdelbach Ó Briain Muircheartach Ó Briain Diarmuid mac Toirdelbach Ó Briain Mathghamhain Maonmhaighe Ó Briain Brian Sreamhach Ó Briain Toirdelbhach Maol Ó Briain Conchobhar mac Mathghamhna Ó Briain Tadhg an Glemore Ó Briain Mathghamhain Dall Ó Briain Toirdelbhach Bóg Ó Briain Tadhg an Chomhaid Ó Briain Donnchadh mac Mathghamhna Ó Briain Conchobhar na Srona Ó Briain Toirdelbhach Óg Ó Briain Toirdelbhach Donn Ó Briain Conchobhar mac Toirdhealbaig Ó Briain Murchadh Carrach Ó Briain
Ó Briain Tuamhain	Donough I O'Brien Connor O'Brien Donough II O'Brien Henry I O'Brien Barnabas O'Brien Henry II O'Brien Henry Ibrackan O'Brien Henry Horatio O'Brien Henry III O'Brien
Ó Briain Chláir	Daniel I O'Brien Connor O'Brien Daniel II O'Brien Daniel III O'Brien Charles I O'Brien Charles II O'Brien Charles III O'Brien
Ó Briain Inse Uí Chuinn	Dermod I O'Brien Murrough I McDermot O'Brien Murrough II O'Brien Dermod II O'Brien Murrough III O'Brien William I O'Brien William II O'Brien William III O'Brien James O'Brien Edward Dominic O'Brien Murrough IV O'Brien William IV O'Brien James O'Brien
Ó Briain Drom Ólainn	Donough O'Brien Edward I O'Brien Lucius I O'Brien Edward II O'Brien William Smith O'Brien Lucius II O'Brien Edward Donough O'Brien Lucius William O'Brien Donough Edward Foster O'Brien Pádraig Lucius Ambrose O'Brien Conor Myles John O'Brien
Places	County Clare County Limerick Dromoland Castle
Kinsmen	MacMahon MacConsidine MacLysaght O'Crotty

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