Son of Artoces, husband of an Artaxiad (Arsacid) princess, overthrown by Meribanes II after a reign of, traditionally, 33 years. Earlier, in 36, he was defeated by Mark Antony. 1
------------------------------------
Not all of Artag's sons were Roman hostages: in 63 BC he was succeeded by his son Parnavaz II (also known in Georgian chronicles as Bartom or Bratman). For the next twenty years under Parnavaz II, Iberia-Kartli seems to have been peaceful....
Civil war left Rome unable to dominate Iberia, Armenia or Caucasian Albania. Parthia grew stronger: it crushed Marcus Licinius Crassus's Roman army in 53 BC, and induced Armenia to turn eastwards for allies. (That year Euripides' The Bacchae was performed at the Armenian court, the last gesture of a Hellenic, western-oriented Armenia: the performance was enhanced, or spoiled, by the head of Crassus being flung on stage, forcing the actors to improvise.) By 40 BC Parthia had taken much of Anatolia from Rome. In 36 BC Mark Antony retaliated, but failed because Armenia, Iberia and Caucasian Albania were hostile; he returned with an army under Publius Canidius Crassus to attack Parnavaz II; the Iberian king was quickly turned from foe to friend and forced to join Crassus in the campaign against his neighbour, King Zober of the Caucasian Albanians, who likewise submitted. This episode, too humiliating to be mentioned in Georgian chronicles, is plausibly reported by Cassius Dio. Parnavaz II did not long survive his humiliation: Mirian, King Parnajom's son, who had fled to Iran over 50 years previously, returned to Kartli with a Parthian army. Parnavaz II had an ally from Colchis, his son-in-law Kartam (an Ossetian name), a descendant of Kuji (Parnavaz I's confederate ruler of Colchis), but Mirian II's army killed both. (Parnavaz II's line survived only through his daughter, who escaped to Armenia and gave birth to a son, Aderki.) 2
Latin: Pharnabazus