Col. William O'Brien, 8th Baron Inchiquin, 3rd Baron O'Brien & 3rd Earl of Inchiquin

Colonel William O'Brien, 8th Baron of Inchiquin, 3rd Baron O'Brien of Burren, 3rd Earl of Inchiquin, PC, was the son of William O'Brien, 2nd Earl of Inchiquin and Lady Margareth Boyle. He married his cousin Mary Villiers, daughter of Sir Edward Villiers of Richmond and Frances Howard, the youngest daughter of Theophilus Howard, 2nd Earl of Suffolk and Elizabeth Hume.

Like his father, he was attainted in his absence by the Irish Parliament of King James II in 1689. He was Governor of Kingsale in 1693. He signed the declaration and association in defence of King William III after the assassination attempt against the King in 1697.

He was Privy Councillor to Queen Anne and King George I, Colonel of Foot in 1703 and Mayor of Kilkenny from 1704 to 1705. He was made Governor of County Clare.

William O'Brien, 3rd Earl of Inchiquin was the son of William O'Brien, 2nd Earl of Inchiquin and Lady Margaret Boyle.

He married Mary Villiers, daughter of Sir Edward Villiers and Lady Frances Howard, in April 1691.1

He died on 24 December 1719.

    William O'Brien, 3rd Earl of Inchiquin gained the title of 3rd Earl of Inchiquin.

Children of William O'Brien, 3rd Earl of Inchiquin and Mary Villiers

1.William O'Brien, 4th Earl of Inchiquin+ d. 18 Jul 1777

2.Lady Mary O'Brien+ 2

3.Lieutenant Charles O'Bryan

4.Hon. James O'Bryan+ d. 17 Dec 1771

5.Lady Henrietta O'Brien+ d. 17303

Citations

1.[S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 2, page 2096. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.

2.[S37] Charles Mosley, Burke's Peerage and Baronetage, 107th edition, volume 2, page 2299.

3.[S37] Charles Mosley, Burke's Peerage and Baronetage, 107th edition, volume 1, page 973.

Other References

• Burke, Bernard, Sir. A genealogical and heraldic dictionary of the peerage and baronetage of the British Empire. London : Harrison 1869. page 615