: The transition from simple refuges to complex castles occurred with the motte-and-bailey structure in the 10th and 11th centuries.

: The invention of gunpowder and cannons in the 15th century made vertical stone walls obsolete, as they could not deflect the momentum of modern projectiles. This led to a reconfiguration of urban settlements, separating administrative strongholds from mercantile cities. Theological and Spiritual Context

Historically, a stronghold (from the Old Testament Hebrew misgav ) refers to a fortified, high, or inaccessible dwelling designed for protection against enemies.

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