It goes without saying that it is indispensable in the study of Shoen estates to make clear the process of their inheritance. Especially in recent years, since it is becoming popular to study the power structure by which court nobles kept control of their estates, it is necessary to make clear the process of inheritance of all family domains. In this paper the author has chosen the theme of the estates belonging to the Koga family, about which a considerable number of unsolved problems still remain. The author makes clear the process of inheritance, and after studying the role which the confirmation (ando 安堵) of the imperial court or of the Bakufu took at the time of inheritance, he discusses the kind of power structure with which the Koga family kept control of its Shoen estates. The Koga family Shoen that were inherited from Koga Nagamichi by his heir Michisuke in the 14th century can be divided into two categories : "Konpon Keryo" which belonged to the Koga family from the close of the Heian period to the beginning of the Kamakura era, and "Ike-no-dainagon Keryo" which were given to the Koga family in the latter half of the Kamakura period. By researching the inheritance of the former "Konpon Keryo", the author makes clear that only one of those estates, that is, "Koga-no-sho Yamashiro" was inherited by the Koga family all through the l1th to the 14th centuries, and that all the rest of the estates had once been inherited by other families, but afterwards were taken back by Koga Nagamichi in the 14th century. On the other hand, the latter, "Ike-no-dainagon Keryo" were not inherited directly by the Koga family, that is, from Mitsumori, the heir to Ike-no-dainagon Taira-no-Yorimori. They were first of all allotted out to his seven daughters and afterwards through one of them, that is, the wife of Koga Michitada, and through "Gojyo-no-Tsubone". Then, they were inherited from the Ike family by Koga Michimoto and his sister Kosaka-no-Zenni in the 13th century. In this way, the process of inheritance of the Koga family Shoen in the early middle ages was, to say the least, extremely complicated. Accordingly, in order to prevent quarrels that were apt to arise because of the complicated nature of inheritance, confirmation from the imperial court for "Konpon Keryo" and from the Bakufu for "Ike-no-dainagon Keryo" were needed. That is to say, the role then of confirmation was, in every sense, to prevent quarrels over inheritance. So, at least on a case of Koga family Shoen, we can not support the notion which has been put forward in recent years regarding the confirmation of the Shoen estates of court noble ; namely, that the confirmation was needed in order to make up for the lack of strength in the power of the Shoen proprietors. The aim of this thesis has been to see the comparatively strong, not fragile, power over its Shoen estates by the Koga family, which was proud of its lineage placed next to the Sekkan families and ranked first of the Seiga families that would rise to the rank of Dajyo-Daijin.
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