Theory of dynastic succession - Ouchōkōtairō

Japanese: 王朝交替論 - おうちょうこうたいろん

This is a theory that the lineage of the ancient Japanese emperors was not an unbroken succession, as has been emphasized since the Meiji period, but rather there were several changes in political power. It began with Tsuda Sokichi's argument that there is a paragraph in the Kojiki and Nihon Shoki between Emperor Chuai and Emperor Ojin, and that before Chuai, the lineage of the emperors was passed down from father to son, and there were only titles of emperor, without given names, making it seem unlikely that they actually existed, and that the emperors recorded in the 6th century Teiki were those who came after Ojin. Later, Hayashiya Tojiro preached the ``Ojin New Dynasty Theory,'' which claimed that there were no emperors before Ojin, and Mizuno Yu considered the period before Chūai to be the ``ancient dynasty'' and the period after Ojin to be the ``middle dynasty,'' and thought that the Kuna Kingdom, which fought against Yamataikoku, migrated eastward to form this ``middle dynasty.'' He further developed Egami Hajime's theory that the Yamato dynasty was born from the conquest of a horse-riding people, and argued for what might be called the ``neo-horse-riding people theory.''

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本古代の天皇の系譜は，明治以後強調されたような万世一系ではなく，何回か政治勢力に交替があったとする説。かつて津田左右吉が，《古事記》《日本書紀》には，仲哀天皇と応神天皇の間で一つの段落があり，仲哀以前は天皇の系譜が父子相承となっていたり，天皇の称号だけで諱（いみな）を欠いているなど，実在性に乏しく，6世紀の帝紀（ていき）に記されていたのは，応神より後の天皇であろうとしたことにはじまる。その後，林屋友次郎によって，〈応神新王朝論〉が説かれ，応神以前の天皇は存在しないとされ，水野祐は，仲哀以前を〈古王朝〉，応神以後を〈中王朝〉とし，邪馬台国と戦った狗奴国が東遷して，この〈中王朝〉を形成したと考え，いわば江上波夫が，大和の王朝を騎馬民族の征服によって生まれたとした騎馬民族説をさらに進め，〈ネオ騎馬民族説〉とでもいうべきものを主張した。

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