Historical relationship between the Roman and Iranian empires
Relations between the Roman and Iranian states were established c. 92 BC. It was in 69 BC that the two states clashed for the first time; the political rivalry between the two empires would dominate much of Western Asia and Europe until 628. Initially commencing as a rivalry between the Parthians and Rome, from the 3rd to mid-7th centuries the Roman Empire (later the Byzantine Empire) and its rival Sassanid Persia were recognized as two of the leading powers in the world.[1][2]
The first direct contact between the Roman Republic and the Parthians was c. 92 BC, when Lucius Cornelius Sulla, while proconsul in Cilicia, met the Parthian ambassador Orobazus.[3]Plutarch reports that he managed to take the central seat between the Parthian Ambassador and an ambassador from Pontus, and concluded a treaty that set the Euphrates as the boundary between the two powers. Orobazus was executed on his return to Parthia for allowing Sulla to outmaneuver him, and Sulla himself later came under criticism for being too high-handed in his treatment of such a powerful nation.
The first time the Romans came into direct military contact with Parthia came when Lucullus invaded Armenia in 69 BC, leading to diplomatic friction and clashes on the frontier between Armenia and Parthia. Over the following decades both empires became entangled in each other's civil wars, perhaps beginning with Crassus’s disastrous invasion of Parthia. Parthia was later involved in the civil war after the assassination of Julius Caesar. In 42 BC, when Antony placed a legion in Syria, Cassius’ envoy Labienus joined forces with king Orodes of Parthia and, led by Pacorus, attacked the Levant and the Asia Minor. However, this was not to last as Antony successfully sent his general Publius Ventidius Bassus to recover the lost territory. After some difficulty dealing with local Parthian appointee kings, the Romans finally subdued the regained province and installed Herod the Great as king. Antony’s forces attempted a crossing of the Euphrates at the city of Zeugma but were held back by Parthian defences and had to settle for annexing the Armenian kingdom after deposing its king.
Augustus was loath to seek further conflict with Parthia. However, the coveted standards were still held by the Parthians and this was of great concern to Augustus, forcing him to regain them through a less conventional method. Augustus set up Musa of Parthia as a client Queen.[4] Indeed Musa was an Italian servant-girl who was given to the Parthian monarch Phraates IV (r. 37 BC – 2 BC[5]) as a gift by the Roman Emperor Augustus. Musa quickly became queen and a favourite of Phraates IV, giving birth to Phraataces (Phraates V) about 19 BC. In 2 BC, Musa had Phraates IV poisoned and made herself along with Phraates V the co-rulers of the Parthian Empire. After a short rule, the Parthian nobility, angered by Phraates V's recent acknowledgement of Roman suzerainty in Armenia and his mother's Italian descent, deposed them both from the throne in 4 AD and installed Orodes III as king. Phraates V and Musa fled to Rome, where Augustus welcomed them.
The next half century saw relations between the two nations antagonistic but not overtly hostile, with the Romans unsuccessfully supporting a series of pretender kings, including Claudius in 49 CE, indicating the extent to which Rome was attempting to influence Parthian politics for its own ends. However, during the reign of Nero, Vologases I invaded Armenia and installed his own brother on the throne, disrupting the balance of influence which had hitherto existed there. The ensuing war was ended by a compromise which allowed the Parthian prince Tiridates and his descendants to reign in Armenia on condition that he and his successors received their crown from the Roman emperor and ruled as his clients.
During Vespasian’s rule Parthia seemed to make some attempts to strengthening the ties between the two powers, such as asking to form an alliance at the Caucasus against belligerent Sarmatian tribes and offering assistance to Vespasian against the short lived emperor Vitellius once it became clear that Vespasian would rule. However, both of these Vespasian refused.
Map of the Roman empire in 116–117 AD showing the Trajan conquests in Dacia & Mesopotamia and his control with a "client state" of western Parthia (light green color)
In the 2nd century CE, the balance of power shifted emphatically in favour of the Romans. A series of invasions repeatedly overran Mesopotamia and sacked the Parthian capital of Ctesiphon, made substantial territorial gains in northern Mesopotamia and benefited from the manipulation of frequent Parthian dynastic civil wars, which eventually undermined the Parthian state.
In 113 AD, Trajan invaded Parthia, marching first on Armenia. In 114 AD, he annexed Armenia to the Roman empire, after defeating and killing Parthamasiris, relative of Osroes I of Parthia. Successively he turned south into Parthia itself, taking the cities of Babylon, Seleucia and finally the capital of Ctesiphon in 116 AD. Then Trajan declared Mesopotamia a new province of the Empire. In the process, he also captured the great city of Susa in Khuzestan. Those months of 116 and 117 saw western Parthia as a client state of the Romans.
Trajan originally planned to annex Parthia as part of the Roman Empire, but ultimately decided instead to place Parthamaspates on the throne as a Roman client, doing so in late 116 AD. After the sudden death of Trajan, his successor Hadrian decided that the Roman Empire was too much extended to the east and accepted in late 117 AD a Treaty with the Parthians in which renounced to nearly all the conquests of Trajan in the region.
War over Armenia broke out again in 161 AD, when Vologases IV defeated the Romans there, captured Edessa and ravaged Syria. But soon, in 163 AD, a Roman counter-attack under Statius Priscus defeated the Parthians in Armenia and installed a favored candidate on the Armenian throne.
The following year Avidius Cassius began an invasion of Mesopotamia, winning battles at Dura-Europos and Seleucia and sacking Ctesiphon in 165 AD.
The Antonine plague, possibly of smallpox, which was sweeping Parthia at the time now spread to the Roman army, leading to their withdrawal: the plague killed nearly half of the population in the Italian peninsula (for some months there were nearly 3000 deaths each day in the city of Rome[7]) and the Romans' legions in the eastern territories of their empire were hampered when large numbers of troops succumbed to the disease. With the plague the Roman Empire stopped to grow and started a process of slow disintegration in the next centuries, according to historians like Theodor Mommsen.
However, under Caracalla, an interesting twist in Parthian relations occurred. After submitting a request to marry the daughter of Persian king Artabanus IV (potentially allowing an heir to assume control of both empires), Caracalla massacred the diplomatic party sent to arrange the marriage and attempted an invasion of Persia in 216 AD. This was eventually unsuccessful and the Persians soon retaliated, inflicting heavy losses upon the Romans.
The replacement of the Parthian Empire by that of the Sassanids in 226 CE, which was more stable and effectively organised, shifted the balance of power against the Romans. The neighboring rivaling Sasanian Empire and the Roman-Byzantine Empire were recognized as the two leading world powers, for a period of more than 400 years.[8][9][2]
Frequent Persian aggression during the 3rd century placed Roman defences under severe strain, but the Romans were eventually successful in warding these off and avoiding any territorial losses. Indeed, they eventually made significant gains towards the end of the century, although these were reversed in the mid-4th century. By that time conflicts attained an added religious dimension. It is in this context that the future of Roman–Persian relations would be played out over the remaining centuries, continuing into the Byzantine era. Neither side was able to inflict a decisive and convincing military victory against the other, and the movement between hostilities and diplomacy would continue to play out between each power.
According to some sources, two years before his death, Shapur I married a daughter of Aurelian, and attempted to further Romanize the city of Gundeshapur, which was mainly populated by the Roman prisoners-of-war back then.[10]
In 395 AD, 18,000 Roman populations of Sophene, Armenia, Mesopotamia, Syria, and Cappadocia were captured and deported by the "Huns". the prisoners were freed by the Persians as they reached Persia, and were settled in Slōk (Wēh Ardashīr) and Kōkbā (Kōkhē). The author of the text Liber Calipharum has praised the king Yazdegerd I (399–420) for his treatment of the deportees, who also allowed some to return.[11]
In the 5th century, Romans provided a subsidy as the Sassanians requested, to construct defenses in Derbent, through which incursions from tribes of the northern steppes endangered both empires.[12]
Due to the increase in diplomatic relations between the Empires throughout the medieval period, a visual culture of kingship grew between the Romans and the Persians in the 6th and 7th centuries.[13] In addition, alongside the advancement of diplomatic ties, familial, often flowery and ornate, language also became a significant metaphor to describe the various features of the Romano-Persian political relationship, since it was something both Empires had substantial indigenous predecessors for. [13] Furthermore, these Roman-Persian diplomatic relations peaked during the 6th century, due to extensive communication between Roman emperor Justinian and Persian emperor Kosrow I.[13]
^Norman A. Stillman The Jews of Arab Lands pp. 22 Jewish Publication Society, 1979 ISBN0827611552
^ abInternational Congress of Byzantine Studies Proceedings of the 21st International Congress of Byzantine Studies, London, 21–26 August 2006, Volumes 1-3 pp 29. Ashgate Pub Co, 30 sep. 2006 ISBN075465740X
^Keaveney, Arthur (Summer 1981). "Roman Treaties with Parthia circa 95-circa 64 BC". American Journal of Philology. 102 (2): 195–212. doi:10.2307/294311. JSTOR294311.
^Bigwood, Joan M. (2004). "Queen Mousa, Mother and Wife(?) of King Phraatakes of Parthia: A Re-evaluation of the Evidence". Journal of the Classical Association of Canada. Project Muse. 4 (1): 35–70
^In 30 BCE, Phraates IV usurped the throne of Tiridates who fled to Syria under the protection of the Romans, whence he launched an attack on his native land. Although this failed, an agreement was made whereby he could live under the Romans as a king in exile if he brokered the return of the Roman standards. The standards were returned to the future emperor Tiberius, who received them on an island in the Euphrates
^Norman A. Stillman The Jews of Arab Lands pp 22 Jewish Publication Society, 1979 ISBN0827611552
^Elgood, Cyril (1951). A Medical History of Persia and the Eastern Caliphate from the Earliest Times Until the Year A.D. 1932. University Press. p. 47.
^ abcCanepa, Matthew (2010). The Two Eyes of the Earth: Art and Ritual of Kingship between Rome and Sasanian Iran. Oakland, CA: California Scholarship Online. pp. 6–33, 122–53.
Bigwood, Joan M. (2004). "Queen Mousa, Mother and Wife(?) of King Phraatakes of Parthia: A Re-evaluation of the Evidence". Journal of the Classical Association of Canada. 4 (1). Project Muse: 35–70. doi:10.1353/mou.2004.0027. S2CID164436127.
K. Butcher, Roman Syria and the Near East, Getty Publications, Los Angeles, 2003 ISBN0-89236-715-6
R. C. Brockley, East Roman Foreign Policy, Francis Cairns Publications, Leeds, 1992 ISBN0-905205-83-9
Daryaee, Touraj (2016). "If these Walls Could Speak: The Barrier of Alexander, Wall of Darband and Other Defensive Moats". In Pellò, Stefano (ed.). Borders: Itineraries on the Edges of Iran(PDF). Eurasiatica. Edizioni Ca’ Foscari. ISBN9788869691010.
Shapur Shahbazi, A. (2005). "SASANIAN DYNASTY". Encyclopædia Iranica (online ed.).
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