Odrysian kingdom

c. 480 – 30 BCE · about 450 years approximate dates

The Odrysian kingdom was a union of Thracian tribes in what is now Bulgaria, north-eastern Greece and European Turkey. Under Teres I and Sitalces in the 5th century BCE it was the strongest Thracian state, and Greek writers such as Thucydides described its wealth. It was weakened by Macedon and later became a Roman client before annexation.