This man partnered with locals resentful of taxation to orchestrate the (*) massacre of thousands of Italian settlers in cities such as Ephesus and Pergamon.
Appian relates that this man offered sacrifices on top of mountains in order to emulate his ancestors, which he claimed were Persian kings. The Athenian priest Helianax built a hero-shrine on Delos for this ruler, who styled himself as being of a "noble father" and as a defender of Greeks. Marcus Marius was sent as an advisor to this man by Quintus Sertorius. This man partnered with locals resentful of taxation to orchestrate the (*) massacre of thousands of Italian settlers in cities such as Ephesus and Pergamon. This king's daughter Cleopatra was married off to Tigranes the Great in an alliance. This king legendarily took a small dose of poison each day in order to become immune to poisons and fought three namesake wars against Lucullus, Sulla, and Pompey. For 10 points, identify this greatest king of Pontus.
Appian relates that this man offered sacrifices on top of mountains in order to emulate his ancestors, which he claimed were Persian kings.
Mithridates VI [or Mithridates the Great; or Mithridates Eupator; prompt on partial answer]