149 cision of the council of Vienne in 1311 had lo be paid by the clergy of all Christendom — imposed upon the Swedish clergy, it has proved possible to estimate the number of attungs and ploughlands at which the Swedish acreage was assessed as the following: Number of 1/4 Ploughlands Hunds Härads Attungs Härads Svealand (lutaland 48 88.400 38.400 4.800 4.800 80 320 48 76.800 9.600 96 'Fhe assessment of Swedish acreage was supposed to have been introduced by the first known ruler of a united Swedish kingdom, Olof Eriksson, called Skötkonung, that is tax-king, ca 995—1022. The author has expressed the opinion that the fleet-organizations, existing also in Denmark and Norway in the 12th century, could not have been possible without a previous assessment of acreage and thus it had to be assumed that in Norway as well as in Denmark and Sweden an assessment based on Anglo-Saxon norms was brought about in the latter part of the 10th century. The purpose of this paper is to establish what form the assessment of acreage may have taken in Norway. The best way of finding out the total assessment of acreage in Norway seemed to be by reconstructing the mantal upon which the ledung-fleet was based, all the more as it had been possible to prove that in Sweden a very close relationship existed between attung and ledung-mantal: each mantal seemed to have corresponded to one attung. According to the earliest existing sources, in the 12th century Norway was subdivided into four law-unions, the Frosta-thing in the north, the Gula-thing in the west, the Borgar-thing in the south and the Eidsiva-thing in the east. The adjudication and administration in the territories belonging to these tiling-unions was regulated by laws recorded in the middle of the 12th century. One of these laws the law of Gula-thing — sets out regulations regarding the number of ships in the whole of the Norwegian ledung as well as the construction of the ships
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