Abstract: This article is dedicated to the establishment of precise chronology of the second quarter of the V century in the history of Ancient Japan, as back in the XIX century it was founded out that the reign time of the first Yamato emperors was excessively extended. The researchers were able to determine the proper chronology of the second half of the IV – beginning of the V century; but the precise chronology of the first half of the V century until the middle of the V century, when Japan borrowed the Chinese calendar Yuan Xi Lie, which gave the more precise chronology. The comparison of records of the Chinese dynasty stories about five wangs of Japan in the V century with the records about the Yamato emperors of the same period in Japanese sources, allowed ascertaining time of the reign of the aforementioned monarchs. The author determines the reason of distortion of the Yamato chronology of the second quarter of the V century in “Nihon Shoki”, founded on the cyclic indication of the Korean sources “Baekje Shinchan” that applied the inaccurate cycle, which is 26 years behind times. In restoring the authentic cyclic indicators, considering its shift back to 26 years, the author attempts to reconstruct the chronology of the second quarter of the V century within the accuracy of the year of reign, lunar month and day of event.

Abstract: In this article materials about chronology of reigns of empress Okinaga-tarashi-hime (Jingu) and emperor Homuda-wake (Ojin) are analyzed. At the end of the XIX century researchers realized that time of reigns of the first sovereigns of Yamato are excessively extended. The reasons of it were found out by the Japanese scientist of Naka Michiyo. After that attempts of revision of chronology began. The most significant results are analysed in this article. Histori-ans, having compared materials of Japanese chronicles with the Korean and Chinese sources, found out that the second half of the Jingu’s regency and the most part of Ojin’s reign fell on the second half of IV – the beginning of the V centuries. Unresolved was a problem of time of the beginning of Jingu’s regency and a problem of the end of Ojin’s reign. In article results of the solution of these problems on the basis of comparison of materials of Japanese, Korean and Chinese sources are yielded. It is found out that reign of emperor Chuai came to the end in a year of the Korean campaign of empress Jingu which in the Korean sources is dated 346 AD. The period of the regency of empress Jingu falls on 347-389 AD, and reign of Ojin – on 390 – the end of 414 / beginning 415 AD.