William O'Brien
William O'Brien (2 October 1852 – 25 February 1928) was an Irish nationalist, journalist, agrarian agitator, social revolutionary, politician, party leader, newspaper publisher, author and Member of Parliament (MP) in the House of Commons of the United Kingdom of Great Britain and Ireland. He was particularly associated with the campaigns for land reform in Ireland during the late 19th and early 20th centuries as well as his conciliatory approach to attaining Irish Home Rule.
William O'Brien, 3rd Earl of Inchiquin
William O'Brien was the son of William O'Brien, 2nd Earl of Inchiquin and Lady Margaret 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.