Zephyrion is modern day Mersin, Turkey and has been inhabited for roughly 10,000 years. During that time, it has been conquered and managed by pretty much every civilization. The city grew wealthy from the trade of white lead.
It is mentioned numerous times by ancient authors, though usually as “so and so reached Zephyrion” or “so and so conquered x, y, and zephyrion” (need that ‘z’).