Ariarathes IX Eusebes Philopator: A Mitridatid King of Cappadocia

Introduction

Ariarathes IX Eusebes Philopator was a Mitridatid king of Cappadocia placed on the throne by his father, Mithridates VI of Pontus, around 100 BC and active until about 85 BC. He was installed as a child, reportedly about eight years old, with the Cappadocian aristocrat Gordius acting as his regent after Mithridates arranged the removal of the preceding king, Ariarathes VII.

His tenure was intermittent and defined by external interference and dynastic contest. Cappadocian nobles expelled him in favour of a scion of the older Ariaratean house, and Mithridates repeatedly intervened with Pontic and allied Armenian force to restore his son (notably ca. 95, 93–92 BC and again at the outbreak of the First Mithridatic War). The Roman Senate and its clients, however, repeatedly deposed or reinstated rival claimants, above all Ariobarzanes I Philoromaios, so that control of Cappadocia shifted with the fortunes of Pontus, Armenia and Rome.

Contemporaneous coinage records part of his political identity: early drachms bear a youthful Cappadocian portrait and Athena on the reverse, while later issues display a portrait identified with Mithridates VI, including coins dated to regnal year 15 (86/85 BC), signalling the explicit presentation of Pontic overlordship.

Ancient sources record that Ariarathes IX ceased to rule after the defeat of Mithridates in 85 BC; Plutarch, citing documents recovered by Pompey, reports that Mithridates poisoned his son. Ariarathes IX’s career exemplifies late Hellenistic Cappadocia’s subordination to larger regional powers and the decisive role of Pontic, Armenian and Roman intervention in its monarchy.