 Under Hadrian, the "limes Arabicus" ignored most of the Nabatæan territory and ran northeast from Aila (modern Aqaba) at the head of the Gulf of Aqaba.A century later, during the reign of Alexander Severus, the local issue of coinage came to an end.There was no more building of sumptuous tombs, apparently because of a sudden change in political ways, such as an invasion by the neo-Persian power under the Sassanid Empire.