*Doubts have been thrown on the reality of this incident because a poem, attributed to Nintoku on the occasion, is couched in obviously anachronistic language. But the poem does not appear in either the Records or the Chronicles: it was evidently an invention of later ages.
Under Nintoku's sway riparian works and irrigation improvements took place on a large scale, and thus the eminent historian, Rai Sanyo, may not be without warrant for attributing to this ruler the sentiment quoted in the Chronicles: "A sovereign lives for his people. Their prosperity is his enrichment; their poverty, his loss." Yet it is in connexion with Nintoku's repairs of the Manda river-bank that we find the first mention of a heinous custom occasionally practised in subsequent ages—the custom of sacrificing human life to expedite the progress or secure the success of some public work.
At the same time, that habits indicating a higher civilization had already begun to gain ground is proved by an incident which occurred to one of the Imperial princes during a hunting expedition. Looking down over a moor from a mountain, he observed a pit, and, on inquiry, was informed by the local headman that it was an "ice-pit." The prince, asking how the ice was stored and for what it was used, received this answer: "The ground is excavated to a depth of over ten feet. The top is then covered with a roof of thatch. A thick layer of reed-grass is then spread, upon which the ice is laid. The months of summer have passed and yet it is not melted. As to its use—when the hot months come it is placed in water or sake and thus used." [Aston's Nihongi.] Thenceforth the custom of storing ice was adopted at the Court. It was in Nintoku's era that the pastime of hawking, afterward widely practised, became known for the first time in Japan. Korea was the place of origin, and it is recorded that the falcon had a soft leather strap fastened to one leg and a small bell to the tail. Pheasants were the quarry of the first hawk flown on the moor of Mozu.
Light is also thrown in Nintoku's annals on the method of boatbuilding practised by the Japanese in the fourth century. They used dug-outs. The provincial governor* of Totomi is represented as reporting that a huge tree had floated down the river Oi and had stopped at a bend. It was a single stem forked at one end, and the suzerain of Yamato was ordered to make a boat of it. The craft was then brought round by sea to Naniwa, "where it was enrolled among the Imperial vessels." Evidently from the days of Ojin and the Karano a fleet formed part of the Imperial possessions. This two-forked boat figures in the reign of Nintoku's successor, Richu, when the latter and his concubine went on board and feasted separately, each in one fork.
*This term, "provincial governor," appears now for the first time written with the ideographs "kokushi." Hitherto it has been written "kuni-no-miyatsuko." Much is heard of the koushi in later times. They are the embryo of the daimyo, the central figures of military feudalism.
THE FAMILY OF TAKENOUCHI-NO-SUKUNE
For the better understanding of Japanese history at this stage, a word must be said about a family of nobles (sukune) who, from the days of Nintoku, exercised potent sway in the councils of State. It will have been observed that, in the annals of the Emperor Keiko's reign, prominence is given to an official designated Takenouchi-no-Sukune, who thereafter seems to have served sovereign after sovereign until his death in the year 368, when he must have been from two hundred to three hundred years old. This chronological difficulty has provoked much scepticism. Dr. Kume, an eminent Japanese historian, explains, however, that Takenouchi was the name not of a person but of a family, and that it was borne by different scions in succeeding reigns. The first was a grandson of the Emperor Kogen (B.C. 214-158), and the representatives of the family in Nintoku's era had seven sons, all possessing the title sukune. They were Hata no Yashiro, Koze no Ogara, Soga no Ishikawa, Heguri no Tsuku, Ki no Tsunu, Katsuragi no Sotsu, and Wakugo.
From these were descended the five uji of Koze, Soga, Heguri, Ki, and Katsuragi. Although its founder was an Emperor's grandson and therefore entitled to be called "Imperial Prince" (O), the family connexion with the Throne naturally became more remote as time passed, and from the reign of Ojin we find its members classed among subjects. Nevertheless, the Empress Iwa, whose jealousy harrassed Nintoku so greatly, was a daughter of Katsuragi no Sotsu, and, as with the sole exception of the Emperor Shomu, every occupant of the throne had taken for his Empress a lady of Imperial blood, it may be assumed that the relationship between the Imperial and the Takenouchi families was recognized at that time. The roles which the five uji mentioned above acted in subsequent history deserve to be studied, and will therefore be briefly set down here.
THE KOZE-UJI
This uji had for founder Koze no Ogara. The representative of the fourth generation, Koze no Ohito, held the post of o-omi during the reign of the Emperor Keitai (A.D. 507-531), and his great-grandson was minister of the Left under Kotoku (A.D. 545-654). Thereafter, the heads of the uji occupied prominent positions under successive sovereigns.