Arthur Griffith (Irish: Art Ó Gríobhtha; 31 March 1872 – 12 August 1922) was an Irish politician and writer, who founded and later led the political party Sinn Féin. He served as President of Dáil Éireann from January to August 1922, and was head of the Irish delegation at the negotiations in London that produced the Anglo-Irish Treaty of 1921, attending with Michael Collins.