The pre-eminence assigned to this god by Ælfric and Adam of Bremen is quite in accordance with what can fairly be inferred from the native historical sources. A considerable number of passages in the sagas yield combined proof that by the people at large Thor was regarded as the chief deity, at least in Norway and Iceland: for Sweden and Denmark the evidence is less conclusive, but seems to point in the same direction. It is of great significance, for example, that in all the Scandinavian countries the name of Thor is the one which is most frequently used as a formative element in the names of persons (such as Thor-kell, Stein-thor), and these were evidently quite as common in Sweden and Denmark as in Norway and Iceland. On the other hand, the name of Odin is scarcely ever employed, only one or two instances being found among the Danes and Swedes. Names with Frey- as their first element are more frequent, but are in small proportion compared with those in Thor-. In Danish and Swedish place-names, too, the predominance of Thor is very marked, although Odin and Frey are better represented here than in the case of the personal names. In Norway and Iceland place-names of this kind are rare, but Thorsness and Thorsmark occur in the latter country. The frequency with which Thor's hammer (see below) is represented on Danish and Swedish runic monuments, and the occurrence on ancient Danish stones of the formula 'May Thor hallow this monument' (or 'these runes'), also indicate that the position of this deity was much the same among all branches of the Scandinavian people. In Denmark, too, there are distinct traces of a tendency to hold local assemblies on the day named after the god; in Iceland this was the day on which the famous _Al-thing_ (the legal and legislative assembly of the whole people) began every year, ten weeks after the first day of summer, and in Norway the great law-assembly of the western districts also began its meetings on a Thursday.
For Norway and Iceland there is a considerable amount of more direct evidence than this. In several of the Icelandic historical writings it is expressly stated that some of the leading colonists had a special regard for Thor and his worship. Of one who came from the island of Mostr, on the south-western coast of Norway, it is told that he had the custody of Thor's temple there, and was a 'great friend' of the god, on which account he was called Thorolf (=_Thor-wolf_). This Thorolf fell out with King Harald, and went to inquire of Thor, 'his loving friend,' whether he should make terms with the king or leave the country. The oracle directed him to go to Iceland. He pulled down the temple, and took with him most of the timber, as well as the earth from under the pedestal on which Thor had been seated. On coming near Iceland, he threw overboard the two chief pillars of the temple, on one of which the image of Thor was carved, and declared he would settle wherever Thor made these come ashore. After landing on the south side of Broadfirth, they found that Thor had come ashore with the pillars on a headland, to which they then gave the name of Thor's-ness, while a river in the neighbourhood was also named after the god. When this Thorolf had a son in his old age, he gave him to his friend Thor, and called him Thorstein. Thorstein also gave his own son to Thor, 'and said he should be a temple-priest, and called him Thorgrim.' Another son of Thorolf's sacrificed to Thor, that he might send him pillars for his house, 'and gave his son for this,' which probably means that he also dedicated his son to the god, though one account appears to imply that he actually offered him in sacrifice.