Vistahm
King of Kings of Iranians and non-Iranians
Coin of Vistahm, minted atRay in 595/6.
RivalShahanshah of theSasanian Empire
Reign	590/1–596 or 594/5–600
Predecessor	Khosrow II
Successor	Khosrow II
Died	596 or 600
Spouse	Gordiya
House	Ispahbudhan
Father	Shapur
Religion	Zoroastrianism

Vistahm orBistam (also transliteratedWistaxm,Middle Persian:𐭥𐭮𐭲𐭧𐭬 wsthm^[1]), was aParthian dynast of theIspahbudhan house, and maternal uncle of theSasanianking of kings ofIran,Khosrow II (r. 590–628). Vistahm helped Khosrow regain his throne after the rebellion of another Parthian nobleBahram Chobin, ofHouse of Mihran, but later led a revolt himself, and ruled independently over a region which encompassed the entireIranian East until he was defeated by Khosrow and his allies.

Vistahm and his brotherVinduyih were sons of Shapur and grandsons ofBawi. They belonged to theIspahbudhan, one of theseven Parthian clans that formed the elite aristocracy of theSasanian Empire. The Ispahbudhan in particular enjoyed such a high status that they were acknowledged as "kin and partners of the Sasanians". The family also held the important position ofspahbed of the West, i.e. the Sasanian Empire's southwestern regions (theSawad). A sister of Vistahm had even married the Sasanian shahHormizd IV (r. 579–590), and was the mother of Hormizd's heir,Khosrow II.^[2][3]

Nevertheless, the family suffered, along with the other aristocratic clans, during the persecutions launched by Hormizd IV in his later years: Shapur was murdered, and Vistahm succeeded his father asspahbed of the West. Finally, Hormizd's persecutions led to the revolt of the generalBahram Chobin in 590. Bahram,whose revolt quickly attracted widespread support, marched on the capital,Ctesiphon.^[3][4] There Hormizd tried to sideline the two Ispahbudhan, but was dissuaded, according toSebeos, by his son, Khosrow II. Vinduyih was imprisoned, but Vistahm apparently fled the court; soon after, however, the two brothers appear as the leaders of a palace coup that deposed, blinded and killed Hormizd, raising his son Khosrow to the throne.^[3][5] Unable to oppose Bahram's march on Ctesiphon, however, Khosrow and the two brothers fled toAzerbaijan. Vistahm remained behind to rally troops, while Vinduyih escorted Khosrow to seek aid from the East Romans. On their way, they were overtaken by Bahram's troops, but Vinduyih, pretending to his nephew, allowed himself to be captured to ensure Khosrow's escape. In early 591 Khosrow returned with military aid from the East Romans, and was joined by 12,000 Armenian cavalry and 8,000 troops from Azerbaijan raised by Vistahm. In theBattle of Blarathon, Bahram's army suffered a crushing defeat, and Khosrow II reclaimed Ctesiphon and his throne.^[3][6][7]

The modern historianStephen H. Rapp notes that Vistahm is possibly identical to the Ustam mentioned in theGeorgian sources, the Sasanian commandant (c‛ixist‛avi in Georgian) ofMtskheta inSasanian Iberia.^[8] Rapp adds that if the two indeed happen to be the same person, it shows that themarzban andc‛ixist‛avi of Iberia were Sasanian agents representing different and rivalParthian houses. This, in turn, may have been a manoeuvre devised on purpose by the Sasanian rulers to "exploit intra-Parthian tensions so as to thwart the possibility of a united front inCaucasia against the empire".^[9]

After his victory, Khosrow rewarded his uncles with high positions: Vinduyih became treasurer and first minister and Vistahm received the post ofspahbed of the East, encompassingTabaristan andKhorasan, which according to Sebeos was also the traditional homeland of theIspahbudhan.^[3][10] Soon, however, Khosrow changed his intentions: trying to disassociate himself from his father's murder, theshah decided to execute his uncles. The Sasanian monarchs' traditional mistrust of over-powerful magnates and Khosrow's personal resentment of Vinduyih's patronising manner certainly contributed to this decision. Vinduyih was soon put to death, according to a Syriac source captured while trying to flee to his brother in the East.^[3][11]

At the news of his brother's murder, Vistahm rose in open revolt. According toDinawari, Vistahm sent a letter to Khosrow announcing his claim to the throne through his Parthian (Arsacid) heritage: "You are not worthier to rule than I am. Indeed, I am more deserving on account of my descent fromDarius, son of Darius, who foughtAlexander. You Sasanians deceitfully gained superiority over us [the Arsacids] and usurped our right, and treated us with injustice. Your ancestorSasan was no more than a shepherd." Vistahm's revolt, like Bahrams's shortly before, found support and spread quickly. Local magnates as well as the remnants of Bahram Chobin's armies flocked to him, especially after he married Bahram's sisterGordiya. Vistahm repelled several loyalist efforts to subdue him, and he soon held sway in the entire eastern and northern quadrants of the Iranian realm, a domain stretching from theOxus river to the region ofArdabil in the west. He even campaigned in the east, where he subdued twoHephthalite princes ofTransoxiana, Shaug and Pariowk.^[3][12] The date of Vistahm's uprising is uncertain. From his coinage, it is known that his rebellion lasted for seven years. The commonly accepted dates are ca. 590–596, but some scholars like J.D. Howard–Johnston and P. Pourshariati push its outbreak later, in 594/5, to coincide with the Armenian Vahewuni rebellion.^[13]

As Vistahm began to threatenMedia, Khosrow sent several armies against his uncle, but failed to achieve a decisive result: Vistahm and his followers retreated to the mountainous region ofGilan, while several Armenian contingents of the royal army rebelled and defected to Vistahm. Finally, Khosrow called upon the services of the ArmenianSmbat Bagratuni, who engaged Vistahm nearQumis. During the battle, Vistahm was murdered by Pariowk at Khosrow's urging (or, according to an alternative account, by his wife Gordiya). Nevertheless, Vistahm's troops managed to repel the royal army at Qumis, and it required another expedition by Smbat in the next year to finally end the rebellion.^[3][14]

Despite Vistahm's rebellion and death, the power of the Ispahbudhan family was too great to be broken. Indeed, one of Vinduyih's sons was instrumental in the trial of Khosrow II after his deposition in 628, and two of the sons of Vistahm, Vinduyih and Tiruyih, along with their cousinNarsi, were commanders in the Iranian army that confronted the Muslim Arabs in 634.^[3][15]

The town ofBastam inIran as well as the monumental site ofTaq-e Bostan may have been named after Vistahm.^[3]

• Howard-Johnston, James (2010)."ḴOSROW II".Encyclopaedia Iranica, Online Edition. Retrieved9 November 2013.
• Martindale, John Robert; Jones, Arnold Hugh Martin; Morris, J., eds. (1992).The Prosopography of the Later Roman Empire, Volume III: A.D. 527–641. Cambridge: Cambridge University Press.ISBN 978-0-521-20160-5.
• Pourshariati, Parvaneh (2008).Decline and Fall of the Sasanian Empire: The Sasanian-Parthian Confederacy and the Arab Conquest of Iran. London and New York: I.B. Tauris.ISBN 978-1-84511-645-3.
• Shapur Shahbazi, A. (1989). "BESṬĀM O BENDŌY".Encyclopaedia Iranica, Vol. IV, Fasc. 2. pp. 180–182. Retrieved13 August 2013.

• 6th-century births
• 590s deaths
• Iranian rebels
• House of Ispahbudhan
• Spahbeds
• Murdered Persian monarchs
• Rebellions against the Sasanian Empire
• 6th-century Sasanian monarchs
• 6th-century murdered monarchs
• Generals of Hormizd IV
• Generals of Khosrow II
• Governors of the Sasanian Empire

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