Thracian castle of Eski Polos was used during Hellenistic and Roman periods also. According Ö. Ertuğrul the fortress looks rather like a typical Thracian fortress although was used later until Byzantine period. Commonly the castle is estimated to have been built in 4th century before the Hellenistic Period, during the Philip II Period
See:
- http://arci-ngo.org/bgtrmat/1_1_Study_Province_Kirklareli_EN.pdf
- Polos Kale - The Archaeological Settlements of Turkey - TAY Project