According to currently accepted traditions, the actual founding of the present-day city of Antalya took place in 158/159 BC by King Attalus II of Pergamon (Attalos II). Initially, the city's name was "Attaleia" after the aforementioned king. Through an inheritance arrangement, the kingdom of Attalus was integrated into the Roman Empire starting in 133 BC. Pamphylia split into a multitude of different groups and rulers. These were primarily dedicated to piracy in the Mediterranean. These isolated groups and rulers were ended by Pompey in 67 BC. As already described, Antalya already possessed a large and important port at that time. In the first century AD, this port was probably (according to tradition) a travel stop of the Apostle Paul. This is reflected in the biblical Acts 14:25f. From the fifth century AD, a church can be found within a town in Antalya. This is today's "Kesik Minare Camii." In 130 AD, Emperor Hadrian Attaleia visited the site. The so-called Hadrian's Arch commemorates this to this day. According to a modern tourist guide, this arch is the only remaining entrance gate to the ancient city of Antalya (to the harbor). The city wall ran to both the left and right of Hadrian's Arch (Hadrian's Gate). The arch was built on four pedestals. It features a total of three archways and various ornaments and pillars. Visually, the gate or arch is reminiscent of the Roman triumphal arch.
Source:
antalya-urlaub.com/geschichte-antalyas.php