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See {7:65-72}, and particularly the second half of note [48] on 7:65 . Iram, mentioned in the next verse, seems to have been the name of their legendary capital, now covered by the sands of the desert of Al-Ahqaf.
For the 'Ad see n. 1040 to vii. 65. They seem to have possessed an ancient civilisation, which succumbed when they persistently broke Allah's law.