121–119 BCE: Mithridates II (VI) Eupator Dionysus, son of Mithridates I (V) [1st time].
121–119 BCE: Mithridates III (VII) Chrestus, son of Mithridates I (V) [co-ruler with brother].
121–119 BCE: Laodice (VI), daughter of Antiochus IV of Syria, widow of Mithridates I (V), mother of Mithridates II (VI) and Mithridates III (VII) [regentess].
(Galatian dynasty)
119–108 BCE: Astreodon I, relative (probably brother) of Pylaemenes II.
Broughton, T. Robert S., The Magistrates of the Roman Republic, Vol. I (1951)
Smith, William, Dictionary of Greek and Roman Biography and Mythology, Vol III (1867)
Truhart P., Regents of Nations. Systematic Chronology of States and Their Political Representatives in Past and Present. A Biographical Reference Book, Part 1: Antiquity Worldwide (2000).