Rhoemetalces III - Basileus of Kingdom of Thrace from 38 AD to 46 AD
Rhoemetalces III was a King of the Thracians. He was the son of the Monarch Rhescuporis II. He in association with his cousin-wife Pythodoris II were client rulers of the Odrysian kingdom of Thrace under the Romans from AD 38 to 46, in succession to Pythodoris’ mother Tryphaena and her brother Rhoemetalces II.

Rhoemetalces III was murdered in 46, by insurgents or on the orders of his wife. The subsequent fate of Pythodoris II is unknown; it seems he didn't have any children with his cousin. Thrace became incorporated into the Roman Empire as a province.
Rhoemetalces III
King Rhoemetalces III of Kingdom of Thrace

(1) Rhoemetalces III | Caligula 38-41 AD
AE unit Thrace
Obverse: Diademed draped bust of Rhoemetalces III left; BAΣIΛEYΣ_POIMHTAΛKAΣ
Reverse: Laureate head of Caligula left; ΓAIΩ KAIΣAP_I ΣEBAΣΤΩ
Ref: Caligula RPC 1723; BMC 2; Jurukova ...