Battle of Edessa

Prior to the battle, Shapur I had penetrated several times deeply into Roman territory, conquering and plundering Antioch in Syria in 253 or 256. After defeating the usurper Aemilianus and assuming the power for himself, Valerian arrived in the eastern provinces as soon as he could (254 or 255) and gradually restored order.[6] Soon he had to confront a naval Gothic invasion in northern Asia Minor. The Goths ravaged Pontus and moved south into Cappadocia. An attempt from Valerian and his army in Antiocheia to intercept them failed because of the plague. While his army was in that weakened state, Shapur invaded northern Mesopotamia in 260, probably in early spring.[4]

A fine cameo showing an equestrian single combat (mard o mard) between Shapur I and Valerian in which the latter is seized, according to Shapur's own statement, "with our own hand"

In his sixties, the aged Valerian marched eastward to the Sasanian borders. According to Shapur I's inscription at the Ka'ba-ye Zartosht, Valerian met the main Persian army, under the command of Shapur I, between Carrhae and Edessa (in Middle Persian: Urhāy), with units from almost every part of the Roman Empire, together with Germanic allies,[7] and was thoroughly defeated and captured with his entire army.[4][8]

According to Roman sources, which are not very clear, the Roman army was defeated and besieged by the Persian forces. Valerian subsequently tried to negotiate, but he was captured; it is possible that his army surrendered after that. The prisoners included, according to Shapur's claims, many other high-ranking officials, including a praetorian prefect,[9] possibly Successianus. It has also been claimed that Shapur went back on his word by having the emperor seized after agreeing to truce negotiations.[10]

"Shapur Captures the King of Rum", Persian miniature from Shahnameh

There are varying accounts as to Valerian's fate following his capture at the hands of Shapur.

Some scholars claim Shapur sent Valerian and some of his army to the city of Bishapur, where they lived in relatively good conditions. Shapur used the remaining soldiers in engineering and development plans, as the Romans were skilled tradesmen and artisans. Band-e Kaisar (Caesar's dam) is one of the remnants of Roman engineering located near the ancient city of Susa.[11]

According to another source (Lactantius), Shapur humiliated Valerian, using the former emperor as a human stepping-stool while mounting his horse. He was reportedly kept in cage and was humiliated for the Persian Emperor's pleasure, according to Aurelius Victor. Upon his death, Valerian's body was allegedly skinned and stuffed with, depending on which account, manure or straw, to produce a trophy of Roman submission preserved in a Persian temple.[9][10]

However, there are also accounts that stipulate he was treated with respect, and that allegations of torture may have been fabricated by Christian historians of the Late Antiquity to show the perils that befell persecutors of Christianity.[10]

Following Valerian's capture, Shapur took the city of Caesarea and deported some 400,000 of its citizens to the southern provinces of the Sassanian Empire.[12] He then raided Cilicia, but he was finally repulsed by a Roman force that was rallied by Macrianus, Callistus and Odenathus of Palmyra.

Valerian's defeat at Edessa became the catalyst for a series of revolts that would lead to the temporary fragmentation of the Roman Empire. In the East, Macrianus used his control of Valerian's treasury to proclaim his sons Macrianus Minor and Quietus as Emperors. Along the Danubian frontier, Ingenuus and Regalianus were also proclaimed Emperors. In the West, the Roman governor Postumus took advantage of Gallienus' distraction to murder the Imperial heir Saloninus and take control of what is now called the Gallic Empire.[9]

• Lactantius, De Mortibus Persecutorum, v.
• Zosimus, New History, i.
• Abdolhossein Zarinkoob, Ruzgaran: tarikh-i Iran az aghz ta saqut saltnat Pahlvi, Sukhan, 1999. ISBN 964-6961-11-8
• Potter, David S., The Roman Empire at Bay AD 180–395, Routledge, 2004. ISBN 0-415-10058-5

• "Valerian" on De Imperatoribus Romanis.