(28 November 1875 – 14 August 1942) was an Irish nationalist of the early 20th century, who upheld Brehon Law.
He was President of the Supreme Court of the Irish Republic, Chief Judicial Commissioner of Ireland and a Judge of the High Court and the Supreme Court of Ireland.
He was selected by the League of Nations to oversee the [[Saar (protectorate)#Post World War I1935_Saar_status_referendum and was a Senator of the National University of Ireland.
He was also a noted scholar, philosopher and author, whose 1911 translation of Immanuel Kant's Critique of Judgement is still widely used by students today.
In 1896, he won the British championship for the Quarter mile race.
He is the grandfather of the bronze casting sculptor Rowan Gillespie.