The first affirmative mention of the people is made by Adam of Bremen around 1070, in reference to the leidang shipping fleet.
This important pilgrimage & trade route is mentioned by Adam of Bremen in 1070.
Adam of Bremen's description of the sacrifices and the cultic centre in Uppsala is the best known account of pre-Christian rituals in Sweden.
Infernus cited the ecclesiastical writer Adam of Bremen as the inspiration for the album's title, parodying his maxim Quantos Possunt ad Christianitatem Trahunt.
One pilgrim’s route for Swedish pilgrims lay through Eidskog, Solør and Elverum; Adam of Bremen mentions this route as early as 1070.
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No texts survive from this area, though the written text Vita Ansgari ("The life of Ansgar") by Rimbert (c. 865) describes the missionary work of Ansgar around 830 at Birka, and Gesta Hammaburgensis Ecclesiae Pontificum (Deeds of Bishops of the Hamburg Church) by Adam of Bremen in 1075 describes the archbishop Unni, who died at Birka in 936.
Terra Feminarum, described in Gesta Hammaburgensis Ecclesiae Pontificum (Deeds of Bishops of the Hamburg Church) by Adam of Bremen in 1075, is presumed to refer to the Finnic Kvenland, which at the time covered a part of the modern-day Finland.
Adam of Bremen relates in his work Gesta Hammaburgensis Ecclesiae Pontificum (Deeds of Bishops of the Hamburg Church) that his son Anund Emundsson died when leading a Swedish attack against Terra Feminarum and the attack ended in Swedish defeat.
The issue is further complicated by a number of references to various Dani people in Scandinavia or other places in Europe in Greek and Roman accounts (like Ptolemy, Jordanes, and Gregory of Tours), as well as some mediaeval literature (like Adam of Bremen, Beowulf, Widsith and Poetic Edda).
Scholars agree that this addition was most probably borrowed from Adam of Bremen and his description of the Temple at Uppsala.
This might mean that he sailed off from Hamburg or Bremen instead of some port in Baltic Sea, since the later account by Adam of Bremen gives the distance of Scania and Birka to be only 5 days at sea.
Rudolf Simek says that, regarding Adam of Bremen's account of the temple, "Adam's sources for this information are of extremely varying reliability, but the existence of a temple at Uppsala is undisputed."