The Thracian horseman god was celebrated as a god of hunt, live and death, good harvest, a god who hears and knows all, the god whose image probably became a predecessor of the image of Saint George in the Christian religious believes.

Antoninus Pius was the emperor of Rome in 2 century when the sanctuary of the Thracian horseman god at the Roman town of Sostra was built. It is believed the Christians destroyed the sanctuary in 4 century. The remains of the sanctuary were of a main building and other buildings of 300 square meters.

Nearby they found a wooden bridge of 8 meters width over Osam River to connect the sanctuary of the Thracian horseman and the local Roman fortress and an area of craftsmen of the Roman town those produced clay pots. The names of Thracians who became Roman soldiers were written either in Greek or Latin on stone.