The Persian King Who Took a Roman Emperor Alive Was an Enemy Rome Built Itself
Shapur I destroyed two Roman armies and captured the emperor Valerian, making him Rome's most dangerous enemy in the East; but his victories were more a consequence of the third-century crisis than a cause of it.
The video won't play here. Listen to the audio instead:
The argument · tap a timestamp to hear it
Rome built the Sasanian dynasty by grinding Parthia down for decades
From Trajan onward Rome invaded Parthia again and again, setting up provinces beyond the Euphrates and weakening the Arsacid dynasty over several decades. The Sasanian family were originally the local governing house of Fars, watching one Parthian king after another fail to hold Rome back. In 224 they defeated and overthrew Artabanus IV and founded a new dynasty. The guest says plainly that the Sasanian rise is directly connected to Rome having broken the Arsacids — it is blowback from sustained Roman military pressure.
Shapur's bloodline was stitched together after the fact, not inherited
Shapur's origins are wrapped in layers of legend: he may have been the son of Ardashir and a Parthian princess, he may have been adopted, and there are versions in which his mother was executed and he was hidden away as a child. The guest points out that these contradictions are themselves the evidence of legitimacy being constructed. The scholar Khodad Rezakhani argues that the Sasanian family did not come from the Persian heartland at all but from Sakastan, which is why they needed myth and inscription to stitch the old Arsacid royal line together with a new Zoroastrian monarchy. To understand Shapur, start with that legitimacy project.
Shapur says he killed an emperor; no Roman source admits it
At the battle of Misiche in 244, Shapur's inscription claims he met the Roman army in a pitched battle, destroyed it utterly and killed the emperor Gordian III. Roman sources accept that Gordian died in connection with this episode, but not one of them says he fell in battle: some say he was killed by his own troops, others that he was wounded and died later. The guest notes that having narratives from both sides of the same battle is almost without parallel. The divergence itself is the reminder that every one of Shapur's "victories" has to be read inside a frame of propaganda and counter-propaganda.
Taking 37 cities is no longer a matter of border friction
After Gordian's defeat, Philip was forced into a treaty, but Rome broke it in Armenia, and Shapur immediately launched a second large-scale offensive. Winning at Barbalissos, he moved into Syria, and the inscription lists the fallen cities one by one: Antioch, one of the richest cities in the entire eastern Mediterranean, was taken too. In all he captured 37 towns in the region. This was no longer border friction but the first systematic Sasanian sweep through Rome's interior — and it set up Valerian's military gamble directly.
A Roman emperor was taken alive for the first time and never came back
In the third campaign, in 260, Shapur says that while he was besieging Carrhae and Edessa, Valerian came against him with an army of seventy thousand, drawn from Germania, Noricum, Pannonia, Spain, Africa, Thrace, Bithynia, Asia and elsewhere. Shapur's inscription says: with our own hands we took Valerian Caesar prisoner. This was the first time in Roman history that an emperor was captured alive. Valerian never left Persia again; the later stories of the footstool and the flaying cannot be verified. Tens of thousands of captured Roman soldiers were settled in new cities, shaping the street grids, the mosaics, and even bringing early Christianity with them.
It was Palmyra, not the Roman army, that stopped the Sasanians
After Valerian's capture, what actually pushed the Sasanians back was not the regular Roman army but Odaenathus (欧达那图斯), king of Palmyra — Zenobia's husband, who was fighting as a Roman ally. He pursued the Sasanians all the way back west of the Euphrates, allowing the Roman East to stabilise after 260. The guest notes that in the surviving sources this episode and Shapur's victory narrative rarely intersect at all, yet it was precisely this third party that decided where Shapur's offensive stopped.
Shapur was not the cause of the third-century crisis but its result
Asked whether Shapur worsened the third-century crisis, the guest gives a clear verdict: he did not create the crisis; his victories were the product of a crisis already embedded in the Roman state. But those victories also supplied a moral "vindication" for the previous decades of campaigning against Parthia, and opened three centuries of frontier tug-of-war that followed. In the later Sasanian period the two sides called each other brothers, writing in letters that they were the two eyes of the world; and looking the other way, Galerius once captured Narseh's entire family and completed Rome's "revenge". Shapur set the tone of that balance.
Besides Hannibal, only Shapur counts as a long-term defeat
Discussing Rome's greatest enemy, the guest proposes a ranking criterion: look at how Rome defined itself. Hannibal is the perennial answer — as late as the seventh century Roman writers still held up Scipio as the ideal commander, which makes the man he defeated the greatest enemy by extension. Shapur belongs alongside Hannibal because what he inflicted was a long-term defeat; Arminius was more of a psychological shock, and Boudica and Vercingetorix were both put down in the end. Mithridates gets a nomination too, but Shapur ranks higher on the dimension of sustained damage.
In their own words · checked verbatim
He's one of the most formidable enemies that Rome ever faced. A king of kings who rebuilt a fading empire fanned the flames of Rome's 3r century crisis and achieved what was previously thought unthinkable. The capture of an actual Roman emperor.
Tristan Hughes0:00
when people say enemies of Rome, they will think Hannibal or Arminius, maybe even Boddica. People often overlook Shapur. when actually, he's probably he could well be the biggest of them all
Eve McDonald2:07
We made prisoner ourselves.With our own hands.
Eve McDonald44:03
the first time ever.A Roman emperor has been captured.
Eve McDonald44:03
his victories are a result of the crisis that has already embedded itself in the Roman state
Eve McDonald50:00
They are two eyes of the earth
Eve McDonald53:14
If Skkipppy is the greatest of Roman generals, then.The man he defeated is their greatest enemy.
Eve McDonald56:38
Figures
| Duration of the Sasanian dynasty | More than 400 years | 4:15 |
| Shapur I's reign | c. 240–270 | 2:07 |
| Year Artabanus IV was overthrown | 224 | 6:19 |
| Year of Gordian III's decisive battle with Shapur | 244 | 31:55 |
| Towns captured in the 252 offensive | 37 (including Antioch) | 41:00 |
Glossary
- Shahanshah
- Persian for "king of kings", the title Sasanian monarchs used for themselves, signalling authority over the other subordinate kings.
- Ērānšahr
- The Sasanians' own name for their realm, meaning "the land of the Iranians", defined against the "non-Iranian lands".
- Arsacid dynasty
- The dynasty that ruled the Parthian empire and was overthrown by the Sasanian family; its noble houses still held real power under the Sasanians.
How to listen
History writers, podcast producers and ancient-history enthusiasts interested in the Roman–Persian wars, the mechanics of imperial collapse, and the third-century crisis.
Skip the opening ads and the closing book trailer and "greatest enemy" ranking chat; the core is the section on the campaigns of 244–260.