strongholdnoun/ˈstɹɒŋhəʊld/

• 1

  A place built to withstand attack; a fortress.

  • AFter this victory thus opteyned by the Sicambris, they waxed so stronge that they wan frome yᵉ Almaynes dyuers Townes & stronge holds wᵗin Germania, and after that they opteyned yᵉ famous Cytie named Treueris; which as wytnessyth yᵉ Auctour of Cronica Cronicaruin, was firste foundyd in the Towne of the Patryarch Abraham before the Incarnation of Criste.
  • For security's sake they [the Germans] gathered together in villages and cities. These they surrounded with heavy walls and towers, and protected them by castles, erected on steep cliffs and mountains. The custody of these strongholds was entrusted to the most efficient warriors, who in time formed a separate class, the nobility, from which the heads of the whole nation, the princes, kings and emperors were chosen.
• 2

  A place of domination by, or refuge or survival of, a particular group or idea.

  • the last stronghold of the Cornish language
  • With the numerous soldiers of Asia, with all of warlike stores, ships, and military engines, that wealth and power could command, the Turks at once resolved to crush an enemy, which creeping on by degrees, had from their stronghold in the Morea, acquired Thrace and Macedonia, and had led their armies even to the gates of Constantinople, while their extensive commercial relations gave every European nation an interest in their success.