Study at TCU

　I see the Warring States period as an era when Japan was divided into multiple nations (nations by Sengoku daimyo). In the territory of the Sengoku daimyo, there is a miniature Sengoku daimyo called "Kunishu" who has been granted autonomy. I think that the relationship between Sengoku daimyo and "Kunishu" is similar to the relationship between the Edo Shogunate and Daimyo. The goal is to clarify the position of Japanese history during the Warring States period.

　I consider the Sengoku daimyo to be one nation, and position negotiations between the Sengoku daimyo as "diplomatic". In the diplomacy between daimyo, each senior vassal acted as an "agency" and proceeded with negotiations. By examining the specific development and the characteristics of the "agency", it is clarified that the power of the Sengoku daimyo is supported by the vassals.

　From the 1450s, which is the middle of the Muromachi period and the beginning of the Warring States period, to the 1650s, which is the beginning of the Edo period, we regard the period from the Middle Ages to the early modern period. I don't think that the reforms by some powerful people, such as Nobunaga Oda and Hideyoshi Toyotomi, have brought about the early modern period. The working hypothesis is the gradual change that the era of the Middle Ages has ended and the era of the early modern period has begun due to the accumulation of social changes that have occurred over the last 200 years. It is similar to the "long 16th century" in European history.

　Japanese ancient writing has progressed mainly in the ancient Ritsuryo nation and the Kamakura period. However, the reality is that there is little accumulation of paleographies from the late Middle Ages to the early modern period. The ancient document studies of the Sengoku daimyo vary greatly from region to region, and are limited to individual case reports. The major challenge is to systematize the ancient writing studies of the Sengoku daimyo and the Oda and Toyotomi administrations.

　At the temples (shukubo) that make up Koyasan, there is a list of memorial services requested from all over Japan. Unlike the past books of general temples, not only the mourning of the dead, but also the memorial service of living people occupies most of them. Records from the Warring States period remain, and it is a valuable consideration for knowing the names, places of residence, and death dates of influential people in each region, but it has hardly been investigated. We are proceeding with the investigation and introduction, and research on the characteristics as historical materials.