It is an interesting question whether the _King’s Mirror_ was inspired by any earlier work written along similar lines. Originality was a rare virtue in the middle ages, and the good churchmen who wrote books in those days cannot have regarded plagiarism as a mortal sin. The great writers were freely copied by the lesser men, thoughts, titles, statements, and even the wording being often taken outright. It is, therefore, difficult to determine the sources of statements found in the later works, as they may have been drawn from any one of a whole series of writings on the subject under discussion. The writer has not been able to make an exhaustive examination of all the didactic and devotional literature of the centuries preceding the thirteenth, but the search that has been made has not proved fruitful. There is every reason to believe that the author of the _King’s Mirror_ was an independent thinker and writer. He was doubtless acquainted with a large number of books and had drawn information from a great variety of sources; but when the writing was actually done he had apparently a few volumes only at his disposal. In the region where the work seems to have been composed, on the northern edge of European civilization, there was neither cathedral nor monastery nor any other important ecclesiastical foundation where a collection of books might be found.[3] It is likely, therefore, that the author had access to such books only as were in his own possession. But he came to his task with a well-stocked mind, with a vast fund of information gathered by travel and from the experiences of an active life; and thus he drew largely from materials that had become the permanent possession of his memory. This fact, if it be a fact, will also help to explain why so many inaccuracies have crept into his quoted passages; in but very few instances does he give the correct wording of a citation. Footnote 3: There must have been important collections of manuscripts at Nidaros (Trondhjem), where there was a cathedral and several monastic institutions. The _King’s Mirror_ was probably composed in Namdalen, about one hundred miles northeast of Nidaros. See below, pp. 59–60.