three sides; this technique became widely used from the Augustinian age to the fall of the Empire. Unusually for a building of this period, most of the walls and bastions are complete. It has lost only four of its bastions. The walls themselves have been quarried to provide stone for later additions, but from the outside at least they appear much as they did when they were first erected. The walls were built in sections, by groups of gangs, which explains the different textures as you walk along the outer perimeter.

History

The

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