In the following century an Irish Missionary, Virgilius, of Saltzburgh, (called by his countrymen "Feargal, the Geometer,") was maintaining in Germany against no less an adversary than St. Boniface, the sphericity of the earth and the existence of antipodes. His opponents endeavoured to represent him, or really believed him to hold, that there were other men, on our earth, for whom the Redeemer had not died; on this ground they appealed to Pope Zachary against him; but so little effect had this gross distortion of his true doctrine at Rome, when explanations were given, that Feargal was soon afterwards raised to the See of Saltzburgh, and subsequently canonized by Pope Gregory IX. In the ninth century we find an Irish geographer and astronomer of something like European reputation in Dicuil and Dungal, whose treatises and epistles have been given to the press. Like their compatriot, Columbanus, these accomplished men had passed their youth and early manhood in their own country, and to its schools are to be transferred the compliments paid to their acquirements by such competent judges as Muratori, Latronne, and Alexander von Humboldt. The origin of the scholastic philosophy—which pervaded Europe for nearly ten centuries—has been traced by the learned Mosheim to the same insular source. Whatever may now be thought of the defects or shortcomings of that system, it certainly was not unfavourable either to wisdom or eloquence, since among its professors may be reckoned the names of St. Thomas and St. Bernard. We must turn away our eyes from the contemplation of those days in which were achieved for Ireland the title of the land of saints and doctors. Another era opens before us, and we can already discern the long ships of the north, their monstrous beaks turned towards the holy Isle, their sides hung with glittering shields and their benches thronged with fair-haired warriors, chanting as they advance the fierce war songs of their race. Instead of the monk's familiar voice on the river banks we are to hear the shouts of strange warriors from a far-off country; and for matin hymn and vesper song, we are to be beset through a long and stormy period, with sounds of strife and terror, and deadly conflict. BOOK II. CHAPTER I. THE DANISH INVASION.