 By August 271 Zabdas was back in Palmyra, with the Palmyrene empire at its zenith.In 272, the Emperor Aurelian crossed the Bosphorus and advanced quickly through Anatolia, to reconquer the lost provinces now under Palmyra.Entering Issus and heading to Antioch, Aurelian defeated Zabdas in the Battle of Immae, near Antioch.