Ikukyuryobu

…They are also written as 蠕蠕 (Zenzen), 晓晓 (Jiyojiyo), and 抮抮 (Zeizei), and are said to be of Mongolian origin. The core tribe, the Ikukiyuuri tribe, originally belonged to the Xianbei Tuoba tribe, but in the 4th century they escaped from their control, adopted the name Rouran, and took control of Inner Mongolia when the Tuoba tribe established the North China state. In 402, Shelun (?-410) took control of almost all of North Asia and called himself "Qiu Dou Bo Kahan." After that, he controlled the East-West trade route and oppressed the Northern Wei, but in 552 he was defeated by the Turks and scattered, and in 554 he was completely destroyed. …

*Some of the terminology explanations that refer to "Ikuku Ryobu" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…蠕蠕（ぜんぜん），茹茹（じよじよ），芮芮（ぜいぜい）とも書き，モンゴル系といわれる。中核部族たる郁久閭（いくきゆうりよ）部は初め鮮卑拓跋部に属したが，4世紀その支配を脱して柔然の号を立て，拓跋部の華北建国とともに，かわって内モンゴルを制圧した。402年社崙（しやろん）(？‐410)は北アジアのほぼ全域を握って〈丘豆伐可汗〉と称し，以後東西交易路をおさえて北魏を圧迫したが，552年突厥に敗れ四散し，554年完全に潰えた。…

※「郁久閭部」について言及している用語解説の一部を掲載しています。

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