Nagasaki clan

Japanese: 長崎氏 - ながさきうじ

A powerful vassal family of the direct line of the Hojo clan (Tokuso) during the Kamakura period. The Kanmu Heishi clan. It began when Taira Moritsuna, the younger brother of Seki Sanetada, a vassal of Hojo Yasutoki, called himself Nagasaki. Moritsuna succeeded Bito Kagetsuna as steward of Hojo Yasutoki in 1234 (Bunreki 1), and served Tsunetoki and Tokiyori as well. His son Yoritsuna reached the height of his power as steward of the successors Tokimune and Sadatoki, and in 1285 (Kōan 8), he assassinated Adachi Yasumori, the most powerful vassal of the shogunate (Kōan War). However, his sole authority did not last long, and in 1293 (Einin 1), the clan fell into decline after being attacked by Sadatoki (Heizenmon Rebellion), and instead the descendants of Nagasaki Mitsutsuna, Yoritsuna's younger brother (some say nephew), rose to power.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鎌倉時代の北条氏嫡流(得宗)の有力被官家。桓武平氏。北条泰時の被官関実忠の弟平盛綱が長崎を称したのにはじまる。盛綱は1234年(文暦1)尾藤景綱のあとをうけて北条泰時の家令となり，経時･時頼にも仕えた。その子頼綱は続く時宗･貞時の家令としてその権勢を極め，85年(弘安8)には幕府御家人の最有力者安達泰盛を謀殺(弘安合戦)。しかしその専権は長くは続かず，93年(永仁1)貞時の攻撃をうけて一党は没落(平禅門の乱)，かわって頼綱の弟(一説には甥)長崎光綱の子孫が台頭した。

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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