The Government spared no effort to correct the latter result, and some of the devices employed were genuinely progressive. In that epoch travellers had to carry their own provisions, and not uncommonly the supply ran short before they reached their destination, the result sometimes being death from starvation on the roadside. It was therefore ordered that in every district (korf) a certain portion of rice should be stored at a convenient place for sale to wayfarers, and these were advised to provide themselves with a few sen before setting out. It is evident that, since one of the Wado coins sufficed to buy rice for twelve days' rations, a traveller was not obliged to burden himself with many of these tokens. Wealthy persons in the provinces were also admonished to set up roadside shops for the sale of rice, and anyone who thus disposed of one hundred koku in a year was to be reported to the Court for special reward. Moreover, no district governor (gunryo), however competent, was counted eligible for promotion unless he had saved six thousand sen, and it was enacted that all taxes might be paid in copper coin. In spite of all this, however, the use of metallic media was limited for a long time to the upper classes and to the inhabitants of the five home provinces. Elsewhere the old habit of barter continued. THE FORTY-FOURTH SOVEREIGN, THE EMPRESS GENSHO (A.D. 715-723) In the year 715, the Empress Gemmyo, after a reign of seven years, abdicated in favour of her daughter, Gensho. This is the only instance in Japanese history of an Empress succeeding an Empress. HISTORICAL COMPILATION The reigns of these two Empresses are memorable for the compilation of the two oldest Japanese histories which have been handed down to the present epoch, the Kojiki and the Nihongi; but as the circumstances in which these works, as well as the Fudoki (Records of Natural Features), were written have been sufficiently described already (vide Chapter I), it remains only to refer to a custom inaugurated by Gemmyo in the year (721) after the compilation of the Nihongi, the custom of summoning to Court learned men (hakase) and requiring them to deliver lectures on that work. Subsequent generations of sovereigns followed this example, and to this day one of the features of the New Year's observances is a historical discourse in the palace. The writing of history became thenceforth an imperially patronized occupation. Six works, covering the period from 697 to 887, appeared in succession and were known through all ages as the Six National Histories. It is noticeable that in the compilation of all these a leading part was taken by one or another of the great Fujiwara ministers, and that the fifth numbered among its authors the illustrious Sugawara Michizane. THE FORTY-FIFTH SOVEREIGN, THE EMPEROR SHOMU (A.D. 724-748)