Ki and Sei parties - Kisei Ryōtō

Japanese: 紀･清両党 - きせいりょうとう

They are descendants of the Ki and Kiyohara clans who served Futarayama Shrine (commonly known as Utsunomiya Daimyojin), the Ichinomiya of Shimotsuke Province. They were one of the samurai groups that were active under the Utsunomiya clan, the head priest of the shrine, especially during the Kamakura and Nanboku-cho periods. According to the Ki family genealogy and the Haga Hotta family genealogy, the Ki family began when Kiyonokami, who was six generations after Dainagon Kimaro, was the first to live in Shimotsuke as Shimotsuke Daijo (one theory says Shimotsuke no Kami), and at the same time was in charge of shrine affairs. According to the family tree, the Kiyohara clan is a descendant of Prince Toneri, the son of Emperor Tenmu, but the details are unknown.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

下野国一宮二荒山（ふたらやま）神社(俗に宇都宮大明神)に奉仕した紀氏，清原氏の子孫。とくに鎌倉～南北朝期，同神社座主宇都宮氏に従属して活躍した武士団の一つ。《紀氏系図》《堀田芳賀系図》によれば紀氏は大納言紀麻呂より6代後の清主が下野大掾（しもつけだいじよう）(一説に下野守)として初めて下野に住したのに始まり，同時に社職のことをつかさどったという。清原氏は系図上では天武天皇の皇子舎人（とねり）親王の後裔ということになっているが詳細は不明。

出典　株式会社平凡社世界大百科事典第２版について　情報

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