Trebenna is not mentioned by any ancient writer. The name is only known through coins and inscriptions. The city's age probably dates back to classical times. Since Hellenistic times Trebenna was a member of the Lycian League, in the later imperial period Roman Titular colony and in the 5th century bishop's seat. In late antiquity, the city belonged to the province of Pamphylia. Coins are only known from the time of Gordian III.

The ruins of the city lie on a small hill and are surrounded by an early Byzantine defensive wall. Numerous inscriptions and sarcophagi are built into the wall. In the city there are remains of Roman baths and an early Byzantine basilica. Above the city lies an acropolis, with a central Byzantine one-room church.

The fortifications of the Acropolis, visible today, date from Byzantine times, while the buildings on the Agora were built or renovated in Roman times. The Ekklesiasterion (meeting room) was the most important public building in the city. The apse-like recess in the rear area suggests its use as a consultation room and as an Odeon.

Trebenna lost its importance with the end of the Byzantine Empire and was abandoned. There is still a Catholic Titular Bishopric of Trebenna.

Fortifications on the south side of the Acropolis

Gravecave below the Acropolis

Die Nekropolen weisen einige Besonderheiten auf. So konnten hier in den Fels geschlagene Rundostotheken (Ostothek > „Knochenkiste“) lokalisiert werden, wie sie in dieser Form bisher nur in den Nekropolen Trebennas zu finden sind.

The ruins of the ancient city of Trebenna are 22 km south-west of Antalya at today's places Geyikbayırı / Çağlarca.

You reach the city by taking the D400 after the last overpass, do not follow the D400 towards Kemer, but continue straight on the 07-75, the Hürriyet Cad.
After approx. 9 km turn off in the centre of the village Bahtılı, direction Adamlar. After about 4 km, in Hacısekililer Köyü, turn right, direction Geyikbayırı and Çağlarca. The road is signposted. After passing the cliffs at Josito-Camp you circle the village Geyikbayırı. At the apex of a hairpin bend 2 roads branch off. The road on the left leading downhill was signposted in October 2013 with a small blue signpost " Başkoz ". Follow this road into the forest. After approx. 2.5 km, a path branches off to the left at a round concrete power pole.
This path leads after about 1 km to the ruins of the ancient city of Trebenna. It can be driven on with a normal car with caution and some driving skills.