The Roman-Sasanian Wars in the Kurdish Highlands: Five Centuries of Empires at War
- Dala Sarkis
- 1 hour ago
- 8 min read
Introduction
For nearly five centuries, the territories that now make up Kurdistan were the principal battlefield of the ancient world's two greatest empires. From Trajan's invasion of Mesopotamia in 115 CE to the death of the Emperor Julian on the banks of the Tigris in 363 CE, Rome and Persia fought a succession of devastating wars across the mountains, river valleys, and fortress cities of the Kurdish highlands. The names that echo through these campaigns — Nisibis, Singara, Bezabde, Amida — are the names of places in what is now southeastern Turkey and northern Iraq.
These wars mattered enormously for the peoples who lived in the conflict zone. They were not passive bystanders; they manned the fortress garrisons, served as auxiliary troops on both sides, built the defensive walls, and suffered the consequences when cities changed hands. The Roman-Sasanian frontier ran directly through the territory of Gordyene and Zabdicene — the same highland regions that had been home to the Karduchoi six centuries earlier and would later become the heartland of the Kurdish emirates. This article traces the major campaigns that turned the Kurdish highlands into the most fought-over territory in the ancient world.
Contents
The Kurdish Highlands as Imperial Frontier
The Roman-Persian frontier ran through the heart of what is now Kurdistan. The key fortress cities — Nisibis (modern Nusaybin), Singara (near modern Sinjar), Amida (modern Diyarbakır), and Bezabde (in the region of Zabdicene/Cizre) — all lay within or adjacent to the territories of Gordyene, Zabdicene, and the upper Tigris valley. This was not coincidental. The same geography that made these highlands strategically important to the Assyrians a thousand years earlier made them the inevitable frontier zone between Rome and Persia.
The mountain passes controlled access between the Mesopotamian plains and the Iranian plateau. The river crossings of the Tigris and its tributaries determined the routes of invasion and retreat. The fortified cities that guarded these crossing points became the objects of siege after siege, changing hands between empires while the local populations endured the devastation of centuries of warfare.
Trajan's Invasion of Mesopotamia (115–117 CE)
The first major Roman campaign through the Kurdish highlands came under Emperor Trajan in 115 CE. After annexing Armenia in 114, Trajan launched a full-scale invasion of Parthian Mesopotamia. Roman forces captured Nisibis and Singara, subjugated the kingdom of Adiabene, and marched down the Tigris to seize the Parthian capital Ctesiphon. Trajan reached the Persian Gulf — the furthest east any Roman army had ever penetrated.
The route of Trajan's advance led directly through the territories of Gordyene and Adiabene — the same regions that had been home to the Karduchoi and the kingdom of Gordyene. The area around Singara was fortified as a new frontier, and roads were built through the highland territories to support the Roman military presence. But Trajan's conquests proved unsustainable. Rebellions erupted behind his advance, and when Trajan died in 117 CE, his successor Hadrian abandoned most of the eastern conquests, pulling the frontier back to the Euphrates.
The Rise of the Sasanians and Ardashir's Campaigns
In 224 CE, Ardashir I overthrew the Parthian dynasty and established the Sasanian Empire — a far more centralised and aggressive Persian state than its predecessor. Ardashir and his son Shapur I immediately began campaigns to bring the highland zones of the Zagros and upper Mesopotamia under direct Sasanian control. The Kurdish highlands, which had maintained varying degrees of autonomy under the looser Parthian system, now faced a Persian empire determined to eliminate independent highland power centres.
The Roman-Sasanian wars that followed were more intense and destructive than the Roman-Parthian conflicts had been. The Sasanians were more militarily capable than the Parthians, with professional siege capabilities, armoured cavalry, and war elephants. The Kurdish highlands became a permanent war zone, with both empires maintaining chains of fortresses and garrison towns across the upper Tigris valley.
Shapur II and the Nisibis War (337–361 CE)
The most sustained period of warfare in the Kurdish highlands came during the reign of the Sasanian king Shapur II (309–379 CE). Beginning in 337 CE, Shapur launched a series of campaigns against the Roman eastern frontier that lasted over two decades. The war was characterised primarily by siege warfare — Shapur besieged the great fortress city of Nisibis three times without taking it, while both sides fought for control of the smaller fortresses and garrison towns that studded the upper Tigris valley.
The Battle of Singara in 344 CE was the only major pitched battle of the Nisibis War for which detailed accounts survive. Roman and Sasanian forces clashed near the fortress of Singara in what is now the Sinjar district of northern Iraq. Both sides suffered heavy casualties and the result was inconclusive. The Sasanian prince Narseh was killed in the fighting. The pattern of the war was established: neither side could achieve a decisive breakthrough, and the fighting ground on year after year in the mountains and river valleys of the Kurdish highlands.
The Sieges of Singara and Bezabde (360 CE)
After a lull in the 350s while Shapur fought nomadic invaders on Persia's eastern frontier, he returned to the Roman front in 359 with renewed force. In that year he captured the great fortress of Amida (modern Diyarbakır) after a brutal 73-day siege. In 360, Shapur captured both Singara and Bezabde — two of the most important Roman frontier fortresses in the Kurdish highlands.
The siege of Bezabde is particularly significant for Kurdish historical geography. Bezabde was located in Zabdicene — the region immediately adjacent to Gordyene, in what is now the Cizre area of Şırnak Province. Three Roman legions and local archers defended the fortress, but Shapur's army — which included Chionite, Albanian, and Segestani auxiliaries with war elephants — overwhelmed the defenders. The Roman emperor Constantius II subsequently attempted to recapture Bezabde but failed, leaving Shapur in control of key positions across the Kurdish frontier zone.
Julian's Persian Campaign and Death (363 CE)
In 363 CE, the Emperor Julian launched the most ambitious Roman offensive against Persia since Trajan. He assembled a massive army and advanced down the Euphrates, winning a tactical victory at the Battle of Ctesiphon before the walls of the Sasanian capital. But Julian could not take the city and was forced to retreat northward along the Tigris — back through the Kurdish highlands. Harried by Sasanian forces, Julian was killed at the Battle of Samarra during the retreat.
Julian's successor Jovian, trapped deep in Sasanian territory with a demoralised army, was forced to sign a humiliating peace treaty. Rome ceded Nisibis, Singara, and the territory east of the Tigris to Persia — the first time in Roman history that a reigning emperor had voluntarily surrendered territory. The Kurdish highlands, which had been part of the Roman frontier system for four centuries, now passed definitively into the Persian sphere. The fortress cities that had endured siege after siege became Sasanian possessions.
Impact on the Kurdish Highlands
The Roman-Sasanian wars shaped the Kurdish highlands in ways that persisted for centuries. The fortress cities that were built, besieged, rebuilt, and besieged again became the urban anchors of later Kurdish political life. Amida became Diyarbakır — the largest Kurdish city. Nisibis became Nusaybin. The military infrastructure of roads, forts, and garrison towns created a framework that later empires, including the Arabs and Ottomans, would inherit and reuse.
The Roman historian Ammianus Marcellinus, who was personally present during the campaigns of the 350s and 360s, left detailed descriptions of the landscape, towns, and peoples of the frontier zone. His accounts of the sieges of Amida and Bezabde are among the most vivid pieces of military writing from late antiquity, and they describe a region that is recognisably Kurdistan — the same mountains, the same river crossings, the same strategic passes that would determine the outcomes of wars for another fifteen centuries.
Legacy
The Roman-Sasanian wars established a pattern that would define the Kurdish highlands for the rest of their history: the territory of Kurdistan as a frontier zone between competing empires, its people caught between great powers, its cities and passes the objects of endless strategic competition. After Rome and Persia, the same pattern repeated with Byzantium and the Sasanians, the Ottomans and the Safavids, and into the modern era with Turkey, Iraq, Iran, and Syria.
The treaty of 363 CE, in which Rome ceded the Kurdish frontier to Persia, was one of the great turning points of the ancient world. It marked the end of centuries of Roman presence in the upper Tigris valley and transferred the highland populations into a new imperial system. But empires came and went. The mountains and the people who lived in them endured.
Key Events and Timeline
115 CE — Trajan invades Parthian Mesopotamia; captures Nisibis, Singara, and Adiabene; reaches the Persian Gulf
117 CE — Trajan dies; Hadrian abandons most eastern conquests
224 CE — Ardashir I overthrows the Parthians; establishes the Sasanian Empire and begins centralisation of the Kurdish highlands
337 CE — Shapur II launches the Nisibis War against Rome; beginning of decades of warfare in the Kurdish highlands
344 CE — Battle of Singara between Constantius II and Shapur II; heavy casualties on both sides
359 CE — Shapur II captures Amida (Diyarbakır) after a 73-day siege
360 CE — Shapur II captures Singara and Bezabde; Constantius II fails to recapture Bezabde
363 CE — Julian invades Persia; wins at Ctesiphon but cannot take the city; killed during retreat at the Battle of Samarra
363 CE — Treaty of Dura: Jovian cedes Nisibis, Singara, and territory east of the Tigris to Persia; the Kurdish frontier passes into the Sasanian sphere
Frequently Asked Questions
Why were the Roman-Sasanian wars fought in Kurdistan?
The Kurdish highlands sit between the Mesopotamian plains and the Iranian plateau, controlling the mountain passes and river crossings that connected the two empires. The fortress cities of Nisibis, Singara, Amida, and Bezabde guarded these strategic corridors. Whoever controlled the upper Tigris valley controlled the gateway between Rome and Persia.
What was the significance of Julian's death in 363 CE?
Julian's death during his retreat from Persia led to the humiliating Treaty of Dura, in which Rome ceded Nisibis, Singara, and the territory east of the Tigris to the Sasanian Empire. This was the first time a Roman emperor had voluntarily surrendered territory. The Kurdish highlands passed from the Roman to the Persian sphere of influence.
Where was Bezabde?
Bezabde was a Roman fortress city in the region of Zabdicene, adjacent to Gordyene, in what is now the Cizre area of Şırnak Province in southeastern Turkey. It was besieged twice in 360 CE — first captured by Shapur II, then unsuccessfully counter-besieged by Constantius II. The Roman historian Ammianus Marcellinus described both sieges in detail.
References and Further Reading
Ammianus Marcellinus — Res Gestae (eyewitness accounts of the Amida and Bezabde sieges)
Dodgeon, M.H. & Lieu, S.N.C. — The Roman Eastern Frontier and the Persian Wars (AD 226–363), Routledge, 2002
Encyclopaedia Britannica — Trajan: Military Campaigns
Daryaee, T. — Shapur II, Encyclopaedia Iranica
Syvanne, I. — Military History of Late Rome 284–361, Pen and Sword, 2015
Maksymiuk, K. — Geography of Roman-Iranian Wars: Military Operations of Rome and Sasanian Iran, 2019
Marciak, M. — Sophene, Gordyene, and Adiabene: Three Regna Minora of Northern Mesopotamia, Brill, 2017
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