Tourism in the Republic of Ireland on were built by them. As Dublin Airport is located just outside the city, most international visitors to Ireland begin their stay here. Among the main attractions in Dublin are Dublin Castle, the seat of British rule in Ireland until 1922, Phoenix Park, one of the largest inner city parks in the world, The General Post Office, one of Ireland's most famous buildings due to the 1916 Easter rising, Kilmainham Gaol, a former prison turned museum that held and executed the rebels of the 1916 Rising and Trinity College, where the Book of Kells and the Book of Durrow are
John Redmond after 1916 was increasingly eclipsed by ill-health, the rise of Sinn Féin and the growing dominance of Dillon within the Irish Party. June 1917 brought a severe personal blow to Redmond when his brother Willie died in action on the front at the onset of the Battle of Messines offensive in Flanders; his vacant seat in East Clare was then won in July by Éamon de Valera, the most senior surviving commandant of the Easter insurgents. It was one of three by-election gains by Sinn Féin, the small separatist party that had played no part in the Rising, but was