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Leif Erikson Day is an annual observance that occurs on October 9. It honors Leif Erikson (Old Norse: Leifr EirĂksson, Icelandic: Leifur EirĂksson, Norwegian: Leiv Eiriksson, Swedish: Leif Eriksson), the Norse explorer who led the first Europeans thought to have set foot in continental North America (other than Greenland).