Athenodorus, a philosopher, and my friend, who had been at Petra, used to relate with surprise, that he found many Romans and also many other strangers residing there. He observed the strangers frequently engaged in litigation, both with one another and with the natives; but the natives had never any dispute amongst themselves, and lived together in perfect harmony. 22. The late expedition[782] of the Romans against the Arabians, under the command of Ælius Gallus, has made us acquainted with many peculiarities of the country. Augustus Cæsar despatched this general to explore the nature of these [CAS. 779] places and their inhabitants, as well as those of Ethiopia; for he observed that Troglodytica, which is contiguous to Egypt, bordered upon Ethiopia; and that the Arabian Gulf was extremely narrow, where it separates the Arabians from the Troglodytæ. It was his intention either to conciliate or subdue the Arabians. He was also influenced by the report, which had prevailed from all time, that this people were very wealthy, and exchanged their aromatics and precious stones for silver and gold, but never expended with foreigners any part of what they received in exchange. He hoped to acquire either opulent friends, or to overcome opulent enemies. He was moreover encouraged to undertake this enterprise by the expectation of assistance from the Nabatæans, who promised to co-operate with him in everything. 23. Upon these inducements Gallus set out on the expedition. But he was deceived by Syllæus, the [king’s] minister of the Nabatæans, who had promised to be his guide on the march, and to assist him in the execution of his design. Syllæus was however treacherous throughout; for he neither guided them by a safe course by sea along the coast, nor by a safe road for the army, as he promised, but exposed both the fleet and the army to danger, by directing them where there was no road, or the road was impracticable, where they were obliged to make long circuits, or to pass through tracts of country destitute of everything; he led the fleet along a rocky coast without harbours, or to places abounding with rocks concealed under water, or with shallows. In places of this description particularly, the flowing and ebbing of the tide did them the most harm.