Artabanus the Hyrcanian is an obscure historical figure who was reportedly Regent of Persia for a few months (465 BC - 464 BC).
Artabanus probably originated from the province of Hyrcania and reportedly served as the chief official of Xerxes I. He is considered to have served either as his vizier or as his head bodyguard.
Artabanus was according to Aristotle responsible for the death of Crown Prince Darius. He then became afraid that Xerxes would seek revenge and proceeded to assassinate the King. On the other hand Junianus Justinus reported that Artabanus had personal ambitions for the throne. He first secretly murdered Xerxes and then accused Darius of patricide, resulting in his execution. The order of events remains uncertain but Xerxes and Darius certainly left the throne vacant.
Artabanus' course of action is also uncertain. Some accounts have him usurping the throne for himself. Others consider him to have named young Artaxerxes I as King and to have acted as Regent and power behind the throne. This state of affairs would not last more than a few months. Artabanus was reportedly personally slain by the sword-wielding Artaxerxes I either in battle or by surprise. Artabanus is occasionally listed among the Kings of the Achaemenid dynasty though he was not related to them.
External links
Justinus' account on him (http://www.forumromanum.org/literature/justin/english/trans3.html)
At last Artabanus defeated his rival completely and occupied Ctesiphon; Vonones fled to Armenia, where he was acknowledged as king, under the protection of the Romans.
Artabanus was deserted by his followers and fled to the East.
Artabanus took refuge with his vassal, the king Izates of Adiabene; and Izates by negotiations and the promise of a complete pardon induced the Parthians to restore Artabanus once more to the throne (Jos.
Tiberius' nephew and heir Germanicus, whom he sent to the East, concluded a treaty with Artabanus, in which he was recognized as king and friend of the Romans.
But Artabanus was not strong enough for a war with Rome; he therefore concluded a treaty with Vitellius in 37, in which he gave up all further pretensions.
Artabanus took refuge with his vassal, the king Izates of Adiabene; and Izates by negotiations and the promise of a complete pardon induced the Parthians to restore Artabanus once more to the throne.