donjon

…The Norman knights' castles were built in a slightly more advanced style, known as the motte and bailey system. A motte is a small hill, and a circular dry moat was dug, the soil of which was used to build a small mound in the center, and a round tower-shaped keep (donjon) was built by driving logs close together on top of the mound, which served as the residence of the castle lord. Adjacent to one end of the inner bailey, an outer moat was dug around a larger area, a fence was driven around the perimeter, and houses for the family and retainers were built. …

*Some of the terminology that mentions "donjon" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…やや進んだ形式を備えるようになったのはノルマン人騎士たちの居城で，〈モット･アンド･ベーリーmotte and bailey〉システムと呼ばれる。モットは小丘のことで，円形の空堀を掘り，その土で中央に小山を築き，その頂上に丸太杭を密接させて打ち込んで円塔形の天守(キープkeep，ドンジョンdonjon)をつくり，それを城主の居館とした。こうした内郭の一端に隣接して，より広い敷地を囲んで外郭の堀を掘り，周辺に柵を打ち込んで，一族郎党の居住家屋を設けた。…

※「donjon」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