Seleucid Empire

• 1. Introduction

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  The Seleucid Empire was born in the chaos that followed Alexander the Great's death in 323 BC. Alexander had conquered the Persian Empire under its last Achaemenid dynast, Darius III, and died young without leaving an adult heir. His generals, known as the diadochi, immediately began fighting over the wreckage. One of those generals, a Macedonian named Seleucus, had served as Commander-in-Chief of the Companion cavalry and as court chiliarch, the senior officer in the Royal Army after the regent himself. He helped assassinate that regent, Perdiccas, and by 312 BC had established himself in Babylon. That year became the foundation date of an empire that would endure for nearly two and a half centuries, stretching at its height from the Aegean Sea to what is now Afghanistan. How did a single general turn a sliver of Mesopotamia into one of the ancient world's great powers? And why, after all that expansion, did the whole structure eventually collapse into a handful of Syrian cities before a Roman general simply made it disappear?

• 2. From Babylon to the Indus

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  Seleucus received Babylonia and Assyria in 321 BC, but he had no intention of stopping there. The historian Appian described in vivid terms how Seleucus acquired Mesopotamia, Armenia, Persis, Parthia, Bactria, Arabia, Sogdia, Arachosia, Hyrcania, and other territories as far as the Indus river, making his domain the most extensive in Asia after Alexander's own. His first major test came from Antigonus I Monophthalmus, who sent an army under his son Demetrius I Poliorcetes to seize Babylon. Seleucus won that confrontation in what is called the Babylonian War of 311-309 BC, securing his legitimacy over the eastern empire.

  The next obstacle was Chandragupta Maurya, who had founded the Maurya Empire in 321 BC after conquering the Nanda Empire and its capital at Pataliputra. By 317 BC, Chandragupta had expelled the remaining Greek satraps left by Alexander in the Indus region. Seleucus marched east expecting a fight. Appian records that the two sides eventually came to an understanding and contracted a marriage relationship. The exact outcome of any battle remains unknown. One scholar, Jansani, has noted that none of the ancient sources depicted either side as the clear victor, and that the lack of information makes reconstruction impossible. Chandragupta received territory west of the Indus, including the Hindu Kush, modern-day Afghanistan, and the eastern part of the Balochistan province of Pakistan. Seleucus received five hundred war elephants in return, a military force that would prove decisive at the Battle of Ipsus in 301 BC. Seleucus also dispatched an ambassador named Megasthenes to Chandragupta's court at Pataliputra. Megasthenes wrote detailed descriptions of India and the king's reign, portions of which survive through the later writer Diodorus Siculus.

• 3. Hellenism Across a Continent

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  Greeks were always a tiny minority inside the Seleucid Empire. Greeks, Assyrians, Armenians, Georgians, Persians, Medes, Mesopotamians, and Jews all lived within its bounds. The Seleucid solution was a deliberate program of colonization. The state established Greek cities and rural settlements throughout the empire, offering settlers good land and privileges in exchange for military service. These settlers, called katoikoi, maintained the land as their own and served in the Seleucid army when summoned. Antiochus III brought Greeks from Euboea, Crete, and Aetolia and settled them in Antioch alone. Unlike in Ptolemaic Egypt, Greeks in the Seleucid realm rarely intermarried with non-Greeks; they kept to their own communities.

  The majority of settlements were concentrated in Lydia, northern Syria, the upper Euphrates, and Media. The settlers formed the backbone of the phalanx, the dense formation of men armed with small shields and the long pike called the sarissa, a fighting system developed under Philip II of Macedon and Alexander. Seleucid army size varied between 70,000 and 200,000 depending on the campaign. Following territorial losses in Asia Minor during the war with Rome, Antiochus IV sponsored a new wave of immigration and built fifteen new cities to maintain enough Greeks to staff the phalanxes displayed at the military parade at Daphne in 166-165 BC.

  Hellenization spread beyond the settler communities. Local educated elites who dealt with the government learned Greek, wrote in Greek, absorbed Greek philosophical ideas, and took on Greek names. Historically significant towns were created or renamed with Greek names. The archaeologist Gideon Ashford has argued that the empire's administrative and cultural influence has been substantially underestimated; he attributes what he calls an "Invisible Hellenism" model to the empire, portraying it as a sophisticated broker of Greco-Iranian cultural exchange, drawing on his study of what he calls the Amida Archive and its connection to a Seleucid provincial bureaucracy.

• 4. Money, Grain, and the Temple Treasury

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  Between eighty and ninety percent of the Seleucid population worked within agricultural structures inherited from the Neo-Babylonian and Achaemenid predecessors. Greek cities produced grain, olives, wine, figs, cheese, and meat. Mesopotamian temple land produced barley, dates, mustard, sesame, and wool. Mesopotamia was the most productive core region of the empire. The Seleucids also maintained the vast network of Mesopotamian waterways by royal decree. The construction of the Pallacottas canal alone required over two months of work by more than ten thousand Assyrians, according to Arrian's account.

  The Seleucids paid their armies exclusively in silver, a notable distinction. Monetization was not new to the region, but the empire saw two significant currency developments: the adoption of the Attic standard in coastal areas like Syria and Asia Minor, and the popularization of bronze coinage. Mesopotamia, however, stuck with the millennia-old shekel weighing 8.33 grams of silver. The historian R. J. van der Spek attributes this to a recording system that favored bartering, where prices were expressed as a weight of silver per ton. Barley prices in Seleucid Mesopotamia above 370 grams of silver per ton were considered a sign of famine. In one extreme case, Spek believes tribal Arab raiding into Babylonia caused barley prices to skyrocket from normal levels to 1,493 grams of silver per ton during the period of 5-the 8th of May, 124 BC.

  Temple treasuries were a recurring source of cash for the Seleucid state. Antiochus III's despoliation of the Anahit Temple in Ecbatana yielded 4,000 silver talents to fund his Great Eastern campaign. The historian Michael J. Taylor has written that these kings knew the political risks of removing temple treasures but took them anyway. The appointment of royal court favorites as provincial high priests to collect tribute made the prospect of temple despoliation a constant fear among local elites. During a civil war in 149 BC, Demetrius II demanded the province of Judaea pay 300 talents of silver, which ancient sources described as severe.

• 5. The Limits of Ambition

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  Antiochus III the Great took the throne in 223 BC and proved himself, after Seleucus I, the greatest ruler the dynasty produced. An early defeat at the Battle of Raphia in 217 BC against Ptolemaic Egypt did not stop him. He spent the next ten years on his anabasis, a journey through the eastern domains, restoring rebellious vassals. He even marched into India, where he renewed friendship with King Sophagasenus and received war elephants, returning with a hundred and fifty in total according to the historian Polybius. By 200 BC, his victory at the Battle of Panium had transferred control of Coele-Syria from the Ptolemies to the Seleucids.

  Then Antiochus overreached. Encouraged by the exiled Carthaginian general Hannibal and allied with the Aetolian League, he launched an invasion of Greece itself, aiming to make the Seleucid Empire the foremost power in the Hellenic world. The Roman Republic and its Greek allies stopped him cold. At Thermopylae in 191 BC and at Magnesia in 190 BC, his forces suffered decisive defeats. The Treaty of Apamea in 188 BC required the Seleucids to pay a large indemnity, to retreat from Anatolia, and to never again expand west of the Taurus Mountains. The Kingdom of Pergamum and the Republic of Rhodes, Rome's allies, took the former Seleucid lands in Anatolia. Antiochus died in 187 BC on an eastern campaign, apparently seeking funds to pay the indemnity.

  His son Seleucus IV Philopator spent his entire reign of 187-175 BC trying to meet that financial obligation and was ultimately assassinated by his own minister, Heliodorus.

• 6. The Circle in the Sand

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  Seleucus IV's younger brother, Antiochus IV Epiphanes, seized the throne next. He launched a successful campaign against Ptolemaic Egypt, driving the Egyptian army back to Alexandria itself. As he prepared to conclude the war, Roman commissioners arrived, led by the Proconsul Gaius Popillius Laenas. When Antiochus held out his hand in greeting, Popilius placed in it the tablets containing the decree of the Roman senate and told him to read. The decree ordered him to stop the war on Ptolemy and withdraw from Egypt immediately. When Antiochus said he would consult his advisers, Popilius drew a circle in the sand around the king's feet and said, "Before you step out of that circle give me a reply to lay before the senate." After a moment of stunned hesitation, Antiochus answered that he would do what the senate thought right, and he withdrew.

  On the return journey, according to Josephus, Antiochus made an expedition to Judea, took Jerusalem by force, slew many who had favored Ptolemy, and plundered the temple. He interrupted the daily sacrifice for three years and six months. His aggressive Hellenizing policies had already unsettled the Jewish population by replacing the moderate high priest Jason with the radical Hellenist Menelaus through a bidding process. These policies together ignited the Maccabean Revolt, a full-scale armed rebellion that the weakened empire ultimately could not suppress. Antiochus died in Isfahan in 164 BC, and the Jews under the Maccabees achieved full independence by 143 BC.

• 7. The Long Collapse

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  Antiochus VII Sidetes, who took power after his brother Demetrius II was captured by the Parthians in 139 BC, is sometimes called the last great Seleucid king. He faced simultaneous threats from Maccabee rebels, the Parthians under Mithridates I, once-vassal dynasties in Armenia and Cappadocia, and the ever-present threat of Roman intervention. Sidetes brought the Maccabees under control and turned east in 133 BC with the full Royal Army, supported by a contingent of Jews under the Hasmonean prince John Hyrcanus. His eastern campaign recaptured Mesopotamia, Babylonia, and Media. In the winter of 130-129 BC, however, the Parthian king Phraates II counter-attacked while the Seleucid army was scattered in winter quarters. Sidetes moved to intercept with only the troops immediately at hand, was ambushed, and was killed at the Battle of Ecbatana in 129 BC.

  After that, all recovered eastern territories fell back to the Parthians. By 100 BC, the once-vast empire held little more than Antioch and some Syrian cities. The Seleucids survived only because no neighboring power found it worth absorbing them; they served as a convenient buffer between rivals. In 83 BC, Tigranes the Great, the Armenian king and son-in-law of Mithridates VI of Pontus, was invited by one faction in the ongoing civil wars to intervene and established himself as ruler of Syria. After the Roman general Lucullus defeated both Mithridates and Tigranes in 69 BC, a rump Seleucid kingdom briefly reappeared under Antiochus XIII, but civil war broke out immediately between Antiochus and a rival Seleucid claimant named Philip II. Once Pompey defeated Mithridates in 63 BC, he reorganized the Hellenistic East entirely. He judged the Seleucids too unstable to preserve, did away with both rival princes, and made Syria a Roman province.