Peroz I and the Hephthalite Disaster

Peroz I was king of Sasanian Iran from 459 to 484 CE. His reign began with a civil war and a long drought, and ended in one of the worst defeats in Iranian history, when he and much of his army were killed by the Hephthalites in Central Asia. The disaster left Iran paying tribute in the east and opened decades of upheaval inside the empire.

A contested succession

When Yazdegerd II died in 457, he left two sons and no settled heir. Hormizd III took the crown at Ray, while Peroz gathered an army in the northeast and their mother Denag held the capital. The later Persian tradition says Peroz fled to the king of the Hephthalites and returned with his troops. Armenian historians writing closer to the events give the credit to the powerful Mihran family, whose general captured and executed Hormizd in 459. Many modern historians prefer the Armenian account, though the two versions may both hold some truth.

Either way, Peroz came to power owing a debt to others: to the great noble houses, and perhaps to the eastern neighbours he would spend his reign fighting.

Seven years of drought

Soon after his accession Iran suffered a severe drought. The Persian and Arabic histories describe a famine lasting about seven years, from around 461 to 467, during which rivers and springs dried up. Al-Tabari, drawing on the Persian royal tradition, praises Peroz for his response: he suspended taxes, opened the royal granaries, ordered the rich to share their stores, and threatened to punish any town where someone died of hunger. The tradition claims that only one person starved in the whole empire. The figure is plainly a pious exaggeration, but the story shows how the episode was remembered: as a test that the king passed.

Wars in the east

Peroz’s main concern was the northeastern frontier. In the 460s he fought the Kidarites, a Hunnic people who held Bactria, and defeated them around 466, issuing coins in gold at Balkh to mark his success. In that war the Hephthalites were his allies. With the Kidarites gone, they became his rivals.

Two humiliating defeats

Peroz invaded Hephthalite territory at least twice before his final campaign, and each time he was outmanoeuvred. Procopius tells how the Hephthalites led the Persian army into country where it could neither advance nor retreat, and Peroz had to accept peace on their terms. After the second defeat, according to the reconstruction of modern historians, the ransom was set at thirty mule-loads of silver drachms. Peroz could raise only twenty, left his son Kavad as a hostage, and paid the rest by imposing a special tax. Kavad’s years at the Hephthalite court would later shape his own career.

The trench

In 484 Peroz broke the peace and marched east again. Procopius gives the best-known account of what followed. The Hephthalite king, called Akhshunwar in Arabic sources and Khoshnavaz in the Shahnameh, had a long, deep trench dug across the plain and hidden with reeds and earth, leaving a narrow way through. He sent a small force to show itself and then flee across the hidden path. The Persian cavalry charged after it, fell into the trench and was destroyed. Peroz was killed, and his body was never found. One of his daughters was captured and married to the Hephthalite king.

The place of the battle is uncertain; many historians put it near Balkh, others further west near Herat. A Syriac chronicle attributed to Joshua the Stylite suggests that Peroz may have escaped the trench and died later. The Byzantines, who disliked Peroz, wrote of the defeat as the punishment of an oath-breaker.

Revolt in the Caucasus

While Peroz looked east, the Caucasus rose in revolt. In 482 Vakhtang, king of Iberia (eastern Georgia), killed the Persian-backed viceroy of his land, and in Armenia the noble Vahan Mamikonian led a rising that drove out the Persian governor. Persian armies won several battles, but the revolt was still alive when the news of Peroz’s death arrived and the troops were withdrawn. His brother and successor Balash made peace, granted Armenian Christians freedom of worship, and made Vahan governor. This settlement closed the struggle that had begun at Avarayr in 451.

Religion and the Church of the East

Peroz’s reign saw hardship for some religious minorities. Jewish sources record persecution in Babylonia, including the execution of the exilarch around 470, though the Persian sources tell a different story of Jews attacking priests. At the same time the Church of the East moved further away from Byzantine Christianity. At a synod held at Beth Lapat (Gondishapur) in 484, its bishops adopted the teaching associated with Nestorius, which made them less suspect to the Persian crown. See Christians in the Sasanian Empire.

What the defeat cost Iran

The death of the king and the loss of his army left the empire exposed. The Hephthalites took over parts of Khorasan for a time and Iran paid them tribute for decades. The great noble Sukhra, of the Karen family, gathered a new army in the east and stabilised the frontier, and he and the Mihran general Shapur then placed Balash on the throne. Real power lay with these magnates. The treasury was empty, the eastern provinces were insecure, and the ground was prepared for the crisis of the next reigns, when Kavad I and the movement of Mazdak shook the old order.

Several cities were credited to Peroz, among them foundations named Ram-Peroz near Ray and Shahram-Peroz, identified with Ardabil in Azerbaijan. They show that his reign was not only one of failure, though the final defeat is what the sources remember.

1. 457 Death of Yazdegerd II; war between Hormizd III and Peroz
2. 459 Hormizd III killed; Peroz sole king
3. c. 461–467 Drought and famine
4. c. 466 Victory over the Kidarites
5. 470s–early 480s Two defeats by the Hephthalites; Kavad held as a hostage
6. 482 Revolts in Iberia and Armenia
7. 484 Peroz killed in battle; Balash becomes king