<論説>徳川家康の叙位任官

Abstract

徳川家康の叙位任官については、家康が歴史上重要な人物であるだけに、一般書も含め多く取り上げられてきたが、基礎的事実を十分に検討しないまま、その歴史的意味が論じられている。この問題についての専論は少なく、またこうした研究においても見解が一致していないのが現状である。本稿では、事実関係が不確定な家康の左京大夫・中納言・大納言・左大将任官を中心に分析する。家康は、三河守初任に続いて左京大夫に任じられるが、左京大夫は朝廷関係以外では使用することなく左京大夫任官後も前官の三河守を使用した。朝廷官位使用の特異な事例である。任中納言の年月日は、従来天正十四年(一五八六)十月四日とされてきたが、事実は同年十一月五日であるとし、その意味を秀吉への臣従儀礼の中に位置づけた。また家康の源氏改姓が聚楽第行幸を機になされたとされてきたものを、それに先立つ天正十五年八月には源姓であったことを明らかにした。さらに天正十五年の任左大将は、正保二年(一六四五)の将軍家光の要請をうけて口宣案が改められた折に遡及して任じられたものであり、天正十五年時点での任官の事実はなく、この任左大将をめぐる論争はそもそも成立しないとした。

The study of early-modern Japanese political history has witnessed great progress in recent years. This progress includes a deeper understanding of the ranks and offices awarded to samurai. However, in regard to the fundamental facts and dating of samurai appointments to ranks and offices, there are several theories even regarding such an important political figure during the period as Tokugawa Ieyasu, and there are many misunderstandings. In order to create a political history of this age, confirming the facts and dating of Ieyasu's posts and ranks is a pressing issue. In this article I confirm the facts and dates of Ieyasu's ranks and offices, ascertain under what political circumstances they were granted, and furthermore determine their significance. To the extent that Ieyasu was an important political figure. Ieyasu's appointments to ranks and offices are dealt with in general works of history, but fundamental studies have not been sufficiently conducted, and there is no scholarly consensus regarding them. Ieyasu was first appointed governor of Mikawa province, then Sakyō Daibu (Commissioner of the Left Division of the Capital), Jijū (Chamberlain), Ushōshō (Junior Captain of the Palace Guards of the Right), Sachûjō (Middle Captain), Sangi (Consultant), Chûnagon (Middle Counselor), Dainagon (Major Counselor), Naidaijin (Minister of the Center), Udaijin (Minister of the Right), Seiitaishōgun (Babarian-subduing General), and finally Daijōdaijin (Chancellor). This article chiefly analyzes his appointment to the posts of Sakyō Daibu, Chūnagon, Dainagon, and Sadaishō, for which there has no confirmation in the historical record. Ieyasu was appointed Sakyō Daibu shortly after being named governor of Mikawa. In general, when someone was appointed to a new office, thr person would then be known by his new official title, but Ieyasu did not employ the Sakyō Daibu title except in relationship to the imperial court, and even after being appointed Sakyō Daibu continued to use his previous title, governor of Mikawa. This is an example of a unique use of an imperial title. The date of Ieyasu's appointment to the post of Chūnagon has been seen as having been on the fourth day of the tenth month of Tenshō 14 (1586) on the basis of a draft decree in the Nikkō Tōshōgû monjo found in Kugyō bunin, but I have confirmed that the actual date was the fifth day of the eleventh month of the same year and locate its significance within the course of the ceremonial relationship of lord and vassal with Hideyoshi. Furthermore, Ieyasu's adoption of Minamoto clan affiliation is seen within the context of the imperial progress to the Jurakutei, but I make clear that he had used the Minamoto clan name previously during the eighth month of Tenshō 15, and I present new evidence for consideration of this name change. The Ieyasu's appointment to Sadaishō (General of the Left) in Tenshō 15 can only be traced back to the occasion of request by the third Tokugawa shogun, Iemitsu, for reissuance of an oral decree in Shōho 2 (1645), and I clarify that the supposed appointment in Tenshō 15 is not historically accurate. Kasaya Kazuhiko's proposal of the existence of a Tokugawa Shogunate under a Toyotomi regency that is premised on the Ieyasu's appointment as Saidaishō and the arguments surrounding it are thus unsustainable.