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, 2nd Marquess of Thomond
William O'Brien, 2nd Marquess of Thomond, 6th Earl of Inchiquin KP PC (I) (176521 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. He was created Baron Tadcaster in the British Peerage in 1826.