William O'Brien, 2nd Marquess of Thomond

William O'Brien, 2nd Marquess of Thomond, 6th Earl of Inchiquin KP PC (I) (1765 – 21 August 1846) was an Irish peer. He was born in Ennistymon, County Clare, to Capt. Edward Dominic O'Brien and Mary Carrick. He succeeded by special remainder as Marquess of Thomond in 1808 on the death of his uncle Murrough O'Brien, 1st Marquess of Thomond and was appointed a Privy Councillor and Knight of the Order of St Patrick on 11 November 1809.^[1]

He was created Baron Tadcaster in the British Peerage in 1826.

On his death in 1846 his title passed by the same special remainder to his brother James O'Brien, 3rd Marquess of Thomond.

Family

William O'Brien married Elizabeth Rebecca Trotter (1775–1852), daughter of Thomas Trotter of Duleek co Meath on 16 September 1799. They had no son but four daughters:

Susan Maria married Captain later Rear-Admiral George Frederick Hotham RN and they were parents of Charles 4th Lord Hotham
Sarah married Major William Stanhope Taylor
Mary married Richard White, Viscount Berehaven who succeeded as 2nd Earl of Bantry
Elizabeth married George Stucley Bucke who in 1859 was made Sir George Stucley Stucley, 1st Baronet

References

↑ Rayment, Leigh. "Knights of the Order of St Patrick". Retrieved 2008-12-13.

Peerage of Ireland
Preceded by Murrough O'Brien	Marquess of Thomond 1808–1846	Succeeded by James O'Brien
Peerage of the United Kingdom
New creation	Baron Tadcaster 1826–1846	Succeeded by James 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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