castella

…The area stretches from the Bay of Biscay in the north to the Sierra de Morena in the south, and is divided into Old Castile in the north and New Castile in the south by the Guadarrama and Gredos mountain ranges in the northwest of Madrid. The name Castilla comes from the Latin word castella, the plural of castellum (castle), meaning "country with many fortifications," and appears in documents at the end of the 8th century. It should be noted that the geographical extent of the area is different from that of the Kingdom of Castile.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…北のビスケー湾岸から南はモレナ山脈に至り，マドリード北西部のグアダラマとグレドス両山脈を境に，北の旧カスティリャと南の新カスティリャに二分される。ちなみにCastillaの名はラテン語castellum(城)の複数形カステラcastellaに由来，〈城塞の多い国〉を意味し，8世紀末に文献に現れる。なお，カスティリャ王国とは地理的広がりからして異なる点に注意を要する。…

※「castella」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