During excavations in the western part of the agora, archaeologists came across a valuable epigraphic find - a poetic inscription in ancient Greek, associated with the cult of the Thracian deity Heros.
The inscription read by Nikolai Sharankov reads: I dedicated Heraclid to Heros protecting the entrance (the propylaea).
According to Elena Kesyakova, the find shows that the local Thracian population had a profound influence on the culture of the region during Roman rule.