More than 2,000 years ago Petra was used as a temporary refuge by
nomadic Nabatean Arabs, Bedouins who came north out of Arabia. From a
few caves in a rocky outcrop, easy to defend, the nabateans created
Petra as a fortress city
For more press link :
http://blog.jo.zain.com/mofaouri?mm=1744910964&post=2019&preAll=