There was frequent trade, for from the first century Irish ports were well known to merchants of the Empire, sailing across the Gaulish sea in wooden ships built to confront Atlantic gales, with high poops standing from the water like castles, and great leathern sails--stout hulls steered by the born sailors of the Breton coasts or the lands of the Loire and Garonne. The Irish themselves served as sailors and pilots in the ocean traffic, and travelled as merchants, tourists, scholars and pilgrims. Trading-ships carried the wine of Italy and later of Provence, in great tuns in which three men could stand upright, to the eastern and the western coasts, to the Shannon and the harbours of Down; and probably brought tin to mix with Irish copper. Ireland sent out great dogs trained for war, wool, hides, all kinds of skins and furs, and perhaps gold and copper. But this material trade was mainly important to the Irish for the other wealth that Gaul had to give--art, learning, and religion. Of art the Irish craftsmen took all that Gaul possessed--the great decorated trumpets of bronze used in the Loire country, the fine enamelling in colours, the late-Celtic designs for ornaments of bronze and gold. Goldsmiths travelled oversea to bring back bracelets, rings, draughtboards--"one half of its figures are yellow gold, the others are white bronze; its woof is of pearl; it is the wonder of smiths how it was wrought." They borrowed afterwards interlaced ornament for metal work and illuminated manuscripts. In such arts they outdid their teachers; their gold and enamel work has never been surpassed, and in writing and illumination they went beyond the imperial artists of Constantinople. Their schools throughout the country handed on a great traditional art, not transitory or local, but permanent and national. Learning was as freely imported. The Latin alphabet came over at a very early time, and knowledge of Greek as a living tongue from Marseilles and the schools of Narbonne. By the same road from Marseilles Christianity must have come a hundred years or so before the mission of St. Patrick--a Christianity carrying the traditions and rites and apocalypses of the East. It was from Gaul that St. Patrick afterwards sailed for his mission to Ireland. He came to a land where there were already men of erudition and "rhetoricians" who scoffed at his lack of education. The tribes of Ireland, free from barbarian invasions as they had been free from Roman armies, developed a culture which was not surpassed in the West or even in Italy. And this culture, like the art, was national, spread over the whole land.