Leif Erikson, also known as Leif the Lucky, was a Norse explorer who is thought to have been the first European to set foot on continental America, approximately half a millennium before Christopher Columbus. According to the sagas of Icelanders, he established a Norse settlement at Vinland, which is usually interpreted as being coastal North America. There is ongoing speculation that the settlement made by Leif and his crew corresponds to the remains of a Norse settlement found in Newfoundland, Canada, called L'Anse aux Meadows, which was occupied approximately 1,000 years ago.

The Norsemen were a North Germanic linguistic group of the Early Middle Ages, during which they spoke the Old Norse language. The language belongs to the North Germanic branch of the Indo-European languages and is the predecessor of the modern Germanic languages of Scandinavia. During the late eighth century, Scandinavians embarked on a large-scale expansion in all directions, giving rise to the Viking Age. In English-language scholarship since the 19th century, Norse seafaring traders, settlers and warriors have commonly been referred to as Vikings. Historians of Anglo-Saxon England distinguish between Norse Vikings (Norsemen) from Norway, who mainly invaded and occupied the islands north and north-west of Britain, as well as Ireland and western Britain, and Danish Vikings, who principally invaded and occupied eastern Britain.