Wars with Rome

In 69 bc the Roman general Lucius Licinius Lucullus, in charge of looking after Roman interests in the East, attempted to lure Phraates III into an alliance that would help Rome in its struggle against Pontus and Armenia, but the Parthian king, while still maintaining “friendly” relations with Rome, retained his neutrality. An agreement with the Romans renewed the Euphrates line as a frontier. Three years later the Roman general Pompey the Great replaced Lucullus and succeeded in concluding a real alliance with Phraates III. This proved, however, to be of short duration, for affairs in Armenia, aggravated by Roman operations on Parthian territory, had brought the two empires to a parting of the ways. Pompey replied to Phraates’ protestations by occupying Gordyene, a vassal state of the Parthians, and addressed Phraates with the simple title “king.” Pompey did not trouble himself over entering into direct relations with the sovereigns of Media and Elymais, vassals of Phraates. The position taken by the Romans toward the king of kings was rather more like that of conquerors than of allies. Pompey’s policy became clear: from the Caucasus to the Persian Gulf, he hoped to create a wall of states friendly to Rome that would encircle Parthia, in preparation for Roman conquest.

That action fell within the jurisdiction of the Roman triumvir Marcus Licinius Crassus. As early as 57 bc a conflict with Rome broke out over the case of Mithradates III (58/57–55 bc), who, opposing Orodes II (c. 57–37/36 bc), his brother (both having killed their father, Phraates III), fled to Syria and asked the legate Aulus Gabinius for aid and asylum. The Roman Senate forbade Gabinius to involve himself in the dispute over the succession to the Parthian throne. Three years later the tension between the two powers was settled in bloody fashion, and the rupture was consummated in 53 bc. Without provocation, the army of Crassus—the only one of the triumvirs without military glory (Julius Caesar was conqueror of Gaul, and Pompey was conqueror of the Middle East)—crossed the Euphrates. Orodes protested and invoked the treaty of friendship in vain. Crassus refused to reply until he arrived at Seleucia on the Tigris. It was a brutal breaking of all the agreements concluded in 69 and 66 bc.

The Battle of Carrhae (53 bc), with the Parthians led by Surenas with his light and heavy cavalry, cost Rome seven legions and the lives of Crassus and his son. Through Surenas’s brilliant victory the routes to Iran and India were closed to Rome, and its ambitions in the Orient were so weakened that the Euphrates became not only a political but also a spiritual frontier; no effort at Romanization beyond it was possible any longer. A united Greco-Iranian front protected Asia against the Romanization of Iranianized Hellenism and destroyed the myth of Roman invincibility.

The insignia of the Roman legions fell into Parthian hands, and 10,000 Roman prisoners were sent into captivity in Margiana. The victory over Crassus had great repercussions among the peoples of the East. It shook the Roman position in Asia Minor, Syria, and Palestine, while it restored the Parthians’ confidence in their power and in their ability to resist Rome and promised them a dominant position among the peoples of the East. According to the Greek writer Plutarch, the severed head of Crassus was brought to Orodes like a hunting trophy while he was attending a presentation of Euripides’ play The Bacchae.

The Parthian counterthrust in 52–50 bc under the command of Prince Pacorus (Pakores) was not crowned with success. The Arsacid army did not know how to organize long campaigns or how to lay siege to fortified cities. But soon, civil war in Rome reinforced the position of the Parthians, and Pompey, after being defeated by Caesar, thought of taking refuge among them. It is thought that Orodes, taking advantage of this lull, succeeded in resolving difficulties in the east with the Yuezhiuezhi, even perhaps with the Kushān. In 48 bc, with Pompey dead, Caesar was the absolute master of the Roman world. He was preparing to avenge Crassus’s defeat when he was assassinated in 44 bc. The duty of following through on Caesar’s project fell to Mark Antony. Pacorus, anticipating Antony, crossed into Syria after having concluded an agreement with Quintus Labienus, a Roman commander on the side of Caesar’s assassins who had gone over to the Parthians. The successes of the two armies were startling: Labienus took all of Asia Minor, Pacorus all of Syria and Palestine. For nearly two years all the western provinces of the Achaemenids remained in Parthian hands. In Rome it was rumoured that the Parthians were planning to invade Italy itself. But the successes of the Arsacid armies were as ephemeral as they were remarkable. Disagreement between the two generals weakened their effect. In 39 bc Labienus was conquered by Roman forces under Publius Ventidius and slain. Asia Minor was recovered by the Romans, and the following year the same fate struck Pacorus and his conquests.

Under Orodes II the Parthians had reached the zenith of their power: in the west the Arsacids had for a short time reestablished the empire of the Achaemenids almost in its entirety. Their successes in the east seem to have been equally important. Their capital was moved to Ctesiphon, where a military camp was transformed into a great metropolis, facing Seleucia across the Tigris. At Nisā the city was expanded, the royal palaces were enlarged, and the royal hypogea (catacombs) were enriched with precious pieces of fine Greco-Iranian art.

In 37 bc Orodes was assassinated by his son Phraates IV, who also did away with his brothers and his eldest son. In 36 bc Mark Antony began to carry out the revenge Caesar had planned. He brought his army to Armenia, through which he planned to enter Media and attack Parthia from the north. But cold weather and Phraates’ cavalry combined to force Antony to abandon the fight and return to Syria. In 34 bc he launched another campaign and again suffered heavy losses, and his power struggle with Octavian forced him to abandon his plans for war against the Parthians.

About 30 bc Tiridates II, a pretender to the throne of Parthia supported by Rome, forced Phraates IV to leave Mesopotamia and take refuge with his eastern neighbours, the Scythians, who restored him to power. Driven out, Tiridates took refuge at Rome. He returned again in 26 bc, after which Phraates was able to definitively reestablish his power at the same time that Octavian was inaugurating the imperial period of Roman history.

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