Tiberius Julius Eupator Philocaesar Philoromaios Eusebes (Greek: Τιβέριος Ἰούλιος Ευπάτωρ Φιλόκαισαρ Φιλορώμαίος Eυσεbής, Philocaesar Philoromaios Eusebes, means lover of Caesar, lover of Rome who is the Pius one, flourished 2nd century, died 174), also known as Eupator, was a prince and Roman Client King of the Bosporan Kingdom.
Eupator was the son and heir of the Bosporan King Rhoemetalces by an unnamed wife and was of Greek, Iranian and Roman ancestry. Eupator means in Greek "born of a noble father", and was an honorific epithet also shared by his ancestors: Ptolemaic Prince Ptolemy Eupator, Seleucid King Antiochus V Eupator, King Mithridates VI of Pontus and Anatolian Prince Polemon Eupator.
When Rhoemetalces died in 153, Eupator succeeded him. Eupator reigned as Bosporan King from 153 until his death in 174. On coinage his royal title is in Greek: ΒΑΣΙΛΕΩΣ ΕΥΠΑΤΟΡΟΣ or of King Eupator. He was a contemporary to the rule of the Roman emperors Antoninus Pius, Marcus Aurelius and Lucius Verus.
Eupator is mentioned in the writings of Lucian (Alexander 57). Lucian had witnessed envoys sent by Eupator to travel to Bithynia to pay the Bosporan Kingdom’s yearly tribute to Rome. Apart from this, little is known on his life and reign as King. Eupator married an unnamed woman, and from this marriage had a son called Sauromates II who succeeded him in 174.