Kuno Meyer), spoke in 1899 of the powerful agitation in the "Celtic fringe of the United Kingdom's rich overcoat" and predicted that pan-Celticism would become a political force as important to the future of European politics as the much more established movements of pan-Germanism and pan-Slavism. Other academic treatments included Ernest Renan's La Poésie des races celtiques (1854) and Matthew Arnold's The Study of Celtic Literature (1867). The attention given by Arnold was a double-edged sword; he lauded Celtic poetic and musical achievements, but effeminised them and suggested they needed the cement of a sober, orderly Anglo-Saxon rule. A concept arose among some European philologists, particularly articulated by Karl Wilhelm Friedrich Schlegel, whereby the "care of the national language is a sacred trust", or put more simply, "no language, no nation." This dictum was also adopted by nationalists in Celtic nations, particularly Thomas Davis of the Young Ireland movement, who, contrary to the earlier Catholic-based "civic rights" activism of a Daniel O'Connell, asserted an Irish nationalism where the Irish language would become hegemonic once again. As he claimed a "people without a language of its own is only half a nation." In a less explicitly political context, language revivalist groups emerged such as the Society for the Preservation of the Irish Language, which would later become the Gaelic League. In a Pan-Celtic context, Charles de Gaulle (uncle of the more famous General Charles de Gaulle), who involved himself in Breton autonomism and advocated for a Celtic Union in 1864, argued that "so long as a conquered people speaks another language than their conquers, the best part of them remains free." De Gaulle corresponded with people in Brittany, Ireland, Scotland and Wales, arguing that each needed to cooperate in a spirit of Celtic unity and above all defend their native languages or otherwise their position as Celtic nations would be extinct. A Pan-Celtic review was founded by de Gaulle's comrade Henri Gaidoz in 1873, known as Revue Celtique. In 1867 de Gaulle organised the first ever Pan-Celtic gathering in Saint-Brieuc, Brittany. No Irish attended and the guests were mainly Welsh and Breton. T. E. Ellis, the leader of Cymru Fydd was a proponent of Pan-Celticism, stating "We must work for bringing together Celtic reformers and Celtic peoples. The interests of Irishmen, Welshmen and [Scottish] Crofters are almost identical. Their past history is very similar, their present oppressors are the same and