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The whole city was surrounded by a fortified wall with towers. However, there is evidence that only the palaces were protected by a wall at first and that the outer city wall was added after residential areas had already begun to develop outside the palace. Abd ar-Rahman III also arranged for thousands of antique marble columns to be procured or imported from other sites, mostly from Ifriqiya (despite it being under Fatimid control at the time), to be reused for construction here. Al-Hakam II also reportedly procured many Roman statues and carved sarcophagi, which were used to decorate the grounds.