Thracian kingdom (Roman vassal state)

The Thracian kingdom, alternatively also the Sapaean kingdom, was an ancient Thracian state in the southeastern Balkans that existed from the middle of the 1st century BC to 46 AD. It was dominated by the Sapaean tribe, who ruled from their capital Bizye in what is now northwestern Turkey. Initially only of limited relevance, its power grew significantly after the battle of Actium in 31 BC, when Emperor Augustus installed a new dynasty that proved to be highly loyal and expansive. Conquering and ruling much of Thrace on Roman behalf, it lasted until 46 AD, when Emperor Claudius annexed the kingdom and made Thrace a Roman province.