William O'Brien, 4th Earl of Inchiquin

William O'Brien
4th Earl of Inchiquin
Born	Ireland
Died	Ireland
Spouse(s)	Lady Anne Hamilton
Father	William O'Brien, 3rd Earl of Inchiquin
Mother	Mary O'Brien
Occupation	Politician

William McWilliam O'Brien, 4th Earl of Inchiquin, KB, PC(I) (1700 – 18 July 1777) was an Irish peer and politician.

Background

O'Brien was the eldest son of William O'Brien, 3rd Earl of Inchiquin and his wife, Mary (née Villiers), sister of the 1st Earl of Jersey, and inherited his father's titles in 1719. He founded the predecessor of the present day Royal Cork Yacht Club, the Water Club of the Cork Harbour, in 1720.

Political career

Inchiquin was Whig Member of Parliament for Windsor from 1722 to 1727, for Tamworth from 1727 to 1734, for Camelford from 1741 to 1747 and for Aylesbury from 1747 to 1754. In 1725, he had been appointed a Knight Companion of the Order of the Bath. From 1740 to 1741, he was Grand Master of the Premier Grand Lodge of England, Governor of County Clare from 1741 to 1777 and Custos Rotulorum of County Clare from 1762 to 1767. From 1744 to 1751, he was a Lord of the Bedchamber to Frederick, Prince of Wales and admitted to the Privy Council of Ireland in 1753. On his death in 1777, without surviving male heirs, his titles passed to his nephew, Murrough O'Brien, who was later created Marquess of Thomond.

Family

On 29 March 1720, he married his cousin, Lady Anne Hamilton, the eldest daughter and heiress of George Hamilton, 1st Earl of Orkney, and his wife Elizabeth (née Villiers). His wife became 2nd Countess of Orkney in her own right in 1737. They had five children:

Lady Mary (c.1721–1791), later 3rd Countess of Orkney
William, styled Lord O'Brien (1725–1727)
George, styled Lord O'Brien (1727–1728)
Augustus, styled Lord O'Brien (died in infancy)
Murrough, styled Lord O'Brien, later styled Viscount Kirkwall (1731–1741)

He married, secondly, Mary Moore, daughter of Stephen Moore, 1st Viscount Mount Cashell and Alicia Colville, on 12 October 1761

Additionally, Inchiquin was feted by antiquarians and many of the works of Irish history produced at this time are dedicated to him; as an Anglican deriving his lineage from an old Gaelic family, he was a politique choice for those wishing to disseminate their work in Ascendancy Ireland and Hanoverian Britain.

References

Parliament of Great Britain
Preceded by Sir Henry Ashurst Samuel Travers	Member of Parliament for Windsor 1722–1727 With: Earl of Burford 1722–1726 Lord Vere Beauclerk 1726–1727	Succeeded by Lord Vere Beauclerk Viscount Malpas
Preceded by Hon. Francis Willoughby Hon. George Compton	Member of Parliament for Tamworth 1727–1734 With: Thomas Willoughby	Succeeded by Lord John Sackville Hon. George Compton
Preceded by Sir Thomas Lyttelton Hon. James Cholmondeley	Member of Parliament for Camelford 1741–1747 With: Charles Montagu	Succeeded by The Earl of Londonderry Samuel Martin
Preceded by Charles Pilsworth Hon. William Stanhope	Member of Parliament for Aylesbury 1747–1754 With: Edward Willes	Succeeded by Thomas Potter John Willes
Masonic offices
Preceded by Lord Paisley	Grand Master of the Premier Grand Lodge of England 1726–1727	Succeeded by The Lord Coleraine
Peerage of Ireland
Preceded by William O'Brien	Earl of Inchiquin 1719–1777	Succeeded by Murrough 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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