From certain geographical allusions it is quite clear that the work was written in Norway and in some part of the country that would be counted far to the north. The author mentions two localities in the Lofoten region and he shows considerable knowledge of conditions elsewhere in Halogaland;[132] but it is evident that he did not reside in that part of the kingdom when he was at work on his great treatise. It is generally agreed that the home of the _Speculum Regale_ is Namdalen, a region which lies northeast of the city of Trondhjem and which touches the border of Halogaland on the north.[133] This conclusion is based on certain astronomical observations on the part of the author, namely the length of the shortest day, the daily increase in the length of the day, and the relationship between the length of the sun’s path and the sun’s altitude at noon of the longest and the shortest day.[134] The Norwegian astronomer Hans Geelmuyden has determined that if the author’s statements on these points are to be regarded as scientific computations, they indicate a latitude of 65°, 64° 42´, and 64° 52´ respectively. All these points lie within the shire of Namdalen.[135] As the author can scarcely have been much more than a layman in the fields of mathematics and astronomy, the agreement as to results obtained is quite remarkable. Footnote 132: C. vii. Footnote 133: See the Sorö edition, pp. lix-lx; the Christiana edition, p. v. Footnote 134: Cc. vi, vii. Footnote 135: “Om Stedet for Kongespeilets Forfattelse”: _Arkiv for nordisk Filologi_, I, 205-208. The problem of place is relatively unimportant, but the question of the date of composition has more than mere literary interest. There is nothing in the work itself which gives any clue to the year when it was begun or completed. It seems evident, however, that it was written after the period of the civil wars, though while the terrors of that century of conflicts were yet fresh in the memories of men. For various other reasons, too, it is clear that the _King’s Mirror_ was composed in the thirteenth century and more specifically during the reign of Hakon IV. The allusion to the Byzantine emperor Manuel Comnenus,[136] whose reign began in 1143, gives a definite date from which any discussion of this problem must begin. It is also clear that the work was written after the church had begun to lay claim to power in the government of the state, which was in 1163.[137] The author looks back to an evil time when minorities were frequent and joint kingships were the rule;[138] but the period of joint rule virtually came to a close in 1184 when Sverre became sole king; and the last boy king whom the author can have taken into account was Hakon IV, who was thirteen years old when he was given the royal title. It therefore seems evident that the _King’s Mirror_ was written after 1217, the year of Hakon’s accession. Footnote 136: C. viii. Footnote 137: See above, p. 36. Footnote 138: