Not only did the Viking brain invent our modern ship, but it was the Viking spirit that impelled us as a nation to use the ocean as a highway. The Norseman had discovered America and West Africa many centuries before Columbus or Vasco di Gama. The Norse colonised[19] Greenland, Labrador, and possibly even Massachusetts, and it was on a voyage to Iceland that Jean Cabot heard of America, on whose continent he was the first modern sailor to land, and it is said that it was through him that Columbus, after he had discovered the West Indian Islands, first heard that North America had been proved to be a continent by Cabot's coasting voyage along its shore from Maine to Florida. The Vikings, too, taught us the discipline without which no ship can live through an ocean storm. Their spirit, too, when piracy had died out, led us into trade; for, as we have seen, the Viking was no mere pirate, but ever a trader as well.[20] Their sea-fights live in story, though their traders found no skald or bard, and it is thus that we hear less of their trading or of their civic or domestic life. This spirit of theirs, like their blood, is ever with us still. It has gone into our race, and it keeps coming out in unexpected quarters. Hidden under Celtic colouring and Highland dress, the Viking warrior is there in spirit, glorying in battle, though often apparently no more of a real "Barelegs" by race than was kilted King Magnus. The Berserk fury and stubborn tenacity of our Highland regiments derive their origin from the Viking as well as from the Celtic strain.[21] Our sailors too, had they been Celts, would not readily have left smooth water. It was Viking not Celtic blood that drove them to the open sea. It was Viking skill that built the ships, managed them in storms through Viking discipline, navigated them across the ocean, and gave us the naval and commercial supremacy which founded and preserves our empire overseas. They came to us not only from Norway direct, westwards across the sea. They came to us also from Normandy northwards through England. The first swarms of Norsemen had brought with them rapine and disorder. Later on the Norman came to the north to curb such evils, and to organise, administer, and rule the land. The Normans succeeded in this as signally as the Saxon barons, introduced under Saint Margaret, Malcolm Canmore's Saxon queen, had failed. David I was by education a Norman knight. At heart he was an ecclesiastic. As Scotland's king, he was, in theory, owner of Scotland's soil from the Tweed to the Pentland Firth, and he disposed of it to his feudal barons, mainly Norman, and to religious foundations on Norman lines, as the Norman kings of England had done there before him, in order to organise and consolidate his kingdom; and his successors did the same. Thus, as Professor Hume Brown puts it--[22]