The _King’s Mirror_ is a medieval document; it was in large part inspired by the course of events in Norway during the century of the civil wars; it records the scientific and political thought of a certain definite period in Norwegian history. But even though the author of the work must be classed among the thinkers of his own time, his place is far in advance of most of his fellows. His outlook on the world is broader than that of most medieval writers. In matters of science he is less credulous and less bound by theological thought than others who wrote on these subjects in his own century or earlier. On such questions as the cause of earthquakes and the source of the northern lights he shows an open-mindedness, which is rarely met with in the middle ages.[117] For the author’s view of life was not wholly medieval; on many subjects we find him giving utterance to thoughts which have a distinctly modern appearance. His theory of the state and its functions is distinctly unorthodox. But it is probably in the field of education where the great Northman is farthest in advance of his time. In his day the work of instruction was still in the hands of the church; and the churchmen showed no great anxiety to educate men except for the clerical profession. The _King’s Mirror_, however, teaches that merchants must also be educated: they must learn the art of reckoning and those facts of science that are of interest to navigators; they must study languages, Latin, French, and Norwegian; and they must become thoroughly acquainted with the laws of the land. But the author does not stop here: a merchant should also educate his children. “If children be given to you, let them not grow up without learning a trade; for we may expect a man to keep closer to knowledge and business when he comes of age, if he is trained in youth while under control.”[118] Footnote 117: See Larson, “Scientific Knowledge in the North in the Thirteenth Century”: _Publications of the Society for the Advancement of Scandinavian Study_, I, 141-146. Footnote 118: C. iv. The identity of the author of the _Speculum Regale_ has never been disclosed. Anonymous authorship was not uncommon in medieval Norse literature: many of the sagas were written by men whose names are not known. In the thirteenth century, however, it had become customary for writers to claim the honors of authorship. Our philosopher of the _King’s Mirror_ clearly understood that his readers would be curious to know his name: if the book, he tells us in his introductory chapter, has any merit, that should satisfy the reader, and there is no reason why any one should wish to search out the name of the one who wrote it.[119] Evidently he had a purpose in concealing his identity, and the motive is not far to seek. Footnote 119: C. i.