Coins from Kingdom of Pontus
The Kingdom of Pontus or Pontic Empire was a state founded by the Persian Mithridatic dynasty, which may have been directly related to Darius the Great and the Achaemenid dynasty.

The kingdom was proclaimed by Mithridates I in 281 BCE and lasted until its conquest by the Roman Republic in 63 BCE. It reached its largest extent under Mithridates VI the Great, who conquered Colchis, Cappadocia, Bithynia, the Greek colonies of the Tauric Chersonesos, and for a brief time the Roman province of Asia.

After a long struggle with Rome in the Mithridatic Wars, Pontus was defeated; part of it was incorporated into the Roman Republic as the province Bithynia et Pontus, and the eastern half survived as a client kingdom.

Kingdom of Pontus

(1) Mithradates VI 85-65 BC
AE unit Amisos
Obverse: Head of Mithradates VI as Dionysos wreathed with ivy right
Reverse: AMIΣΟΥ / ethnic below cista mystica draped with panther skin and thyrsos; monogram to left
Ref: Malloy 26c
(2) Pontus 130-100 BC
AE unit Pontus
Obverse: head of horse right, star with 8 rays
Reverse: comet (or star with grain ear) 7 rays and tail
Ref: BM Black Sea 984; SNG Stancomb 653 ...