The leaders of the Easter Rising had proclaimed a republic. Arthur Griffith's Sinn Féin organisation, which had favoured the establishment of a form of dual monarchy between Ireland and Britain, had not taken part in the Rising. In 1917, Griffith's Sinn Féin and republicans under Éamon de Valera came together to form the new Sinn Féin Party. A compromise was reached at the 1917 Ard Fheis (party conference), where it was agreed that the party would pursue the establishment of an independent republic in the short term, until the Irish people could be given the opportunity to decide on the form of government they preferred. This agreement was subject to the condition that if the people chose monarchy, no member of the British royal family would be invited to serve as monarch.