The Emperor Keitai had a large family, but only one son was by the Empress, and as he was too young to ascend the throne immediately after his father's death, he was preceded by his two brothers, Ankan and Senkwa, sons of the senior concubine. This complication seems to have caused some difficulty, for whereas Keitai died in 531, Ankan's reign did not commence until 534. The most noteworthy feature of his era was the establishment of State granaries in great numbers, a proof that the Imperial power found large extension throughout the provinces. In connexion with this, the o-muraji, Kanamura, is quoted as having laid down, by command of the Emperor, the following important doctrine, "Of the entire surface of the soil, there is no part which is not a royal grant in fee; under the wide heavens there is no place which is not royal territory." The annals show, also, that the custom of accepting tracts of land or other property in expiation of offences was obtaining increased vogue. SENKWA Senkwa was the younger brother of Ankan. He reigned only three years and the period of his sway was uneventful, if we except the growth of complications with Korea, and the storing of large quantities of grain in Tsukushi, as a "provision against extraordinary occasions," and "for the cordial entertainment of our good guests" from "the countries beyond the sea." RELATIONS WITH KOREA With whatever scepticism the details of the Empress Jingo's expedition be regarded, it appears to be certain that at a very early date, Japan effected lodgement on the south coast of Korea at Mimana, and established there a permanent station (chinju-fu) which was governed by one of her own officials. It is also apparent that, during several centuries, the eminent military strength of Yamato received practical recognition from the principalities into which the peninsula was divided; that they sent to the Court of Japan annual presents which partook of the nature of tribute, and that they treated her suggestions, for the most part, with deferential attention. This state of affairs received a rude shock in the days of Yuryaku, when that sovereign, in order to possess himself of the wife of a high official named Tasa, sent the latter to distant Mimana as governor, and seized the lady in his absence. Tasa revolted, and from that time Japan's position in the peninsula was compromised. The Koreans perceived that her strength might be paralyzed by the sins of her sovereigns and the disaffection of her soldiers. Shiragi (Sinra), whose frontier was conterminous with that of the Japanese settlement on the north, had always been restive in the proximity of a foreign aggressor. From the time of Yuryaku's accession she ceased to convey the usual tokens of respect to the Yamato Court, and, on the other hand, she cultivated the friendship of Koma as an ally in the day of retribution.