Gunnbjörn Ulfsson (Norwegian, lived circa 10th century), the first European to sight North America
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Ragnvald Ulfsson (beginning 11th century) was a jarl of Västergötland or Östergötland
of a poor Icelander from the Westfjords, the harshest region of the country, who decides to take a polar bear as a present to Sweyn II of Denmark (reigned 1047-74/76, a.k.a. Sveinn Úlfsson).