Éamon de Valera
British newspapers and picture postcards often called the Easter Rising the Sinn Féin rebellion. From 1917 de Valera was president of Sinn Féin.  He and the other survivors of the Rising took over Sinn Féin and then turned into a republican party. Arthur Griffith, had wanted an Anglo-Irish "dual monarchy", with an independent Ireland governed separately from Britain, their only link being a shared monarch, like Canada and Britain today.