In 1494 the armies of the French king, Charles VIII, invaded Italy to capture the kingdom of Naples. They swept through the country and bombarded and destroyed many castles. This invasion signaled the end of the castle as a stronghold of defense. For centuries it had been the dominant fortification in Western Europe for the defense of kings, nobility, and townspeople. Ancient cities were often walled to keep out invaders, and within the walls there was usually a citadel, a strongly built fortification occupying the highest or militarily most advantageous position. A castle is much like such a walled city and its citadel contracted into a smaller space. Castles were basically fortified locations. The word itself comes from the Latin castellum. Up to the 6th century fortifications were primarily communities in which most of the population lived. But in the middle of the 6th century, the armies of the Byzantine Empire began to build strong forts as defensive positions. …
