A shiki (_??_) and a chigyo (_??__??_) are regarded as indications of a landship during the medieval times in Japan. About the shiki, there are two opposite theories; one identifies the shiki in the medieval time with a government post in the anciet, the other regards the shiki as a real right. This dispute has an influence upon historical theories up to now. On the contrary, some historians take a new look on the shiki as a sort of a feud. Representative historians take a theory of a complex about public and private matters to grasp a structure of the medieval history in Japan. According to their viewpoint, a formation of a private ownership is a origin of a feudal ownership. In this article, however, I think a hereditary ownership on the premise that feudal ownerships are established. Therefore, I attend to most of shikis have a word, soden (_??__??_), with that, people living in the medieval claimed a hereditary right in many actions.
The claims for a hereditary right appeared in the middle of the Heian-period, and its owner appointed by his parent was written on a yuzurijo (_??__??_).But hereditary owners were so often infringed by outsiders that they contribute their shiryo (_??__??_) to an influential person to protect himself. And its accepter was looked upon as a lord. At a contribution, a special contract, for example, handed down only to descendants, was exchanged between the both so that an accepter guaranteed the hereditary ownership for a contributor. After that, the lord appointed the contributor a so-and-so shiki, for example, Geshi-shiki (_??__??__??_). The appointment to the shiki yielded to a hereditary contract if it had been not violence of an accepter's right. Consequently I think that the appointment to the shiki was equivalent to a bestowal of a hereditary ownership that the Kamakura-bakufu (_??__??__??__??_) adopted. People living in the medieval thought shiki to be inherited.
About 12th century, powers on the Dynasty worked out logics of a buntsuke (_??__??_) and a betsu-soden (_??__??__??_) from an established system to warrant the inheritance, the former to deny an effect of an inheritance, the latter to deny an appointment. The betsu-soden meant an inheritable right peculiar to a collateral line that was not forfeited by a heir. When the general public claimed a right of a betsu-soden in 13th century, they refused to pay a land-tax to destroy a rule by a lord. I find a good chance to form an exclusive and private landownership. But the betsu-soden was denied by a policy called the kuge-tokusei (_??__??__??__??_), and that brought a change in a feudal phase.
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