Ireland was never subject to Rome, though influenced by Roman trade and culture. From prehistoric times the Irish had done some sea roving, as their Imrama, or sea sagas, attest; and this roving was greatly stimulated in the first few centuries of conversion to Christianity by an abounding access of religious zeal. Irish monks seem to have settled in Iceland before the end of the eighth century and even to have sailed well beyond it. There are good reasons for believing that they had visited most of the islands of the eastern Atlantic archipelagoes. We cannot suppose that this rather reckless persistency ended there in such a period of expansion. It is quite possible that we owe to this trait the Island of Brazil, in the latitude of southern Ireland, as an American souvenir on so many medieval maps (Ch. IV). It is certain that the “Navigatio” of St. Brendan scattered St. Brandan Islands, real or fanciful, over the ocean wastes of a credulous cartography (Ch. III). THE NORSEMEN A little later Scandinavians followed along the northern route, finding convenient stopping points in the Faroes and Iceland, discovered Greenland, and planted two settlements on its southwestern shore in the last quarter of the tenth century (Ch. VII). Some of their ruins, a less number of inscriptions, and many fragmentary relics and residua are found, so that we can form a good idea of their manner of life. Such as it was, it endured more than four hundred years. To contemporary and slightly later geography Greenland appeared most often as a far-flung promontory of Europe, jutting down on the western side of the great water; but sometimes it was thought of as an oceanic island, with greater or less shifting of location, and seems to be responsible for divers mythical Green Islands of various maps and languages.