Leif Erikson
Leif Erikson or Leif Ericson ( 970 – c. 1020) was a Norse explorer from Iceland. He was the first known European to have set foot on continental North America (excluding Greenland), before Christopher Columbus. According to the Sagas of Icelanders, he established a Norse settlement at Vinland, tentatively identified with the Norse L'Anse aux Meadows on the northern tip of Newfoundland in modern-day Canada. Later archaeological evidence suggests that Vinland may have been the areas around the Gulf of St. Lawrence and that the L'Anse aux Meadows site was a ship repair station.
Christopher Columbus
Between 1492 and 1503, Columbus completed four round-trip voyages between Spain and the Americas, each voyage being sponsored by the Crown of Castile. On his first voyage, he independently discovered the Americas and magnetic declination. These voyages marked the beginning of the European exploration and colonization of the American continents, and are thus of enormous significance in Western history.