Heliopolis (Roman Phoenicia)
Indeed the veterans of two Roman legions were established in the city (and region) of Berytus (actual Beyrut) by emperor Augustus: the "Legio V Macedonica" and the "Legio III Gallica"., and Heliopolis from 15 BC to 193 AD formed part of the territory of Berytus.  The population was mainly local in the second century under Hadrian with a few descendants of the Roman colonists and likely varied seasonally with market fairs and the schedules of the Camel caravans to the coast and interior.