What might have been the purpose of the walls in Great Zimbabwe?

Some experts have tried to come up with a list of plausible uses of the various structures at Great Zimbabwe; The great Zimbabwe walls were called The Great Enclosure or Imbahuru and their purpose were; Defence- that is to withstand any attacks from the state’s enemies; They also served as the residence of the ruling family; They separated the ruling class from the commoners. The Great Enclosure was more luxurious than those in the valley where commoners lived.

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