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[[File: Selecuo_I.jpg|300px200px|thumbnail|left|Roman Bronze Bust of Seleucus I (ruled 305-281 BC)]] __NOTOC__
For most of the third and second centuries BC, the Seleucid Empire was the greatest of Alexander the Great’s Hellenistic successor states. Stretching from boundary of Persia to the Mediterranean Sea, and at times including parts of Anatolia, the Seleucid Empire was the largest of all the successor states, but it was also among the most culturally and politically important as well. The Seleucid Dynasty was headquartered in the newly built city of Seleucia and was in many ways the inheritor of ancient Mesopotamian culture as well as the torch bearer of Greek culture in the east, bringing the ideas of Hellenism to Mesopotamia but also allowing the natives to practice their ancient religion. Eventually, though, the greatness that was the Seleucid Empire came to a quick and violent end.
===Parthia and Rome===
[[File: Rome-Seleucia-Parthia_200bc.jpg|300px250px|thumbnail|left|Political Map of the Mediterranean and Near East during the Rule of Antiochus III]]
Until the reign of Antiochus III, the Seleucids claimed most of Persia as theirs, but that began to change during Seleucus II’s rule. A new Persian ethnic group known as the Parthians, led by Arsaces I (ca. 247-217 BC) swooped down from the north to challenge the Seleucid claim to the land. Although not directly linked to the Achaemenid Persians, the Parthians viewed themselves as the true inheritors of Persia and the Seleucids as interlopers, so they immediately began challenging the Seleucid claim to the region. <ref> Brosius, Maria. <i>The Persians: An Introduction.</i> (London: Routledge, 2010), pgs. 84-85</ref> Seleucus II was able to temporarily beat back the Parthians, <ref> Strabo. <i> Geography.</i> Translated by Horace Leonard Jones. (Cambridge, Massachusetts: Harvard University Press, 2001), XI, 8, 8</ref> but the challenge to Seleucid hegemony in the east had been established and things would only get more difficult there for later Seleucid kings.
===Seleucid Dynastic Succession Problems===
[[File: Antiochus_IV.jpg|300px250px|thumbnail|left|Bust of Antiochus IV (ruled 175-164 BC)]]
As intense as the external pressure being exerted on the Seleucid Empire was, the biggest problems came from within. A series of weak rulers, succession problems, and ultimately civil war made the Seleucid Empire ripe to be dismantled by the Parthians and Romans. It is difficult to say precisely when the Seleucid Dynasty’s internal health began declining, but it became apparent after the crown passed from Antiochus IV to his son, Antiochus V (reigned 164-161 BC). It was immediately clear to most that Antiochus V, who was only nine when he became king, was unfit to rule and was especially weak in the face of growing Roman power. It was at that point when Demetrius, the son of former King Seleucus IV (reigned 187-175 BC), decided to leave Rome, where he was being held as a hostage, in order to claim the Seleucid throne. <ref> Bryce, pgs. 207-8</ref> The third century AD Roman historian, Cassius Dio, wrote:
“Now Demetrius, the son of Seleucus, and grandson of Antiochus, who was staying in Rome as a hostage at the time of his father’s death and had been deprived of the kingdom by his uncle Antiochus, had asked for the domain of his father when he learned of the death of Antiochus, but the Romans would neither help him to get it nor permit him to depart from Rome; and he, in spite of his dissatisfaction, had remained quiet. But when this affair of Lysias occurred, he no longer delayed, but escaped by flight and sent a message to the senate from Lycia stating that it was not his cousin Antiochus, but Lysias that he was attacking, with the purpose of avenging Octavius. And hastening to Tripolis in Syria, he won over the town, representing that he had been sent out by the Romans to take charge of the kingdom; for no one had any idea of his flight. Then after conquering Apamea and gathering a body of troops he marched on Antioch; and when the boy and Lysias offered no opposition through fear of the Romans, but came to meet him as friends, he put them to death and recovered the kingdom.” <ref> Cassius Dio. <i> Roman History.</i> Translated by Earnest Cary. (Cambridge, Massachusetts: Harvard University Press, 1954), XX, 9, 25</ref>
The Seleucid throne went into a freefall after Demetrius became king. Although he ruled for more than ten years, he had set the precedent for violent usurpation that would mark the remainder of the Seleucid Dynasty’s history. A pretender to the throne named Alexander Ballas (ruled 150-145 BC) overthrew Demetrius, mainly due to the political connections he made. Although Demetrius claimed to have been a long lost son of Antiochus IV, his claim was dubious and it appears he derived most of his real power from the Ptolemies of Egypt. He married Ptolemy II’s daughter, Cleopatra Thea, which gave the Ptolemies indirect control of the Seleucid Empire. The tangled web of power did not end well for Alexander, though, as his former father in law Ptolemy VI turned against him. Alexander was defeated by a force led by Ptolemy VI and Demetrius II at the Battle of Antioch in 145, further sending the Seleucid Empire into more chaos. <ref> Bryce, pgs. 209-20</ref>
The Seleucid Dynasty was briefly stabilized under the rule of Antiochus VII (ruled 139-129 BC), but it was well on its way to its death knell at that point. Antiochus marched against the Parthians in 130 BC, taking back most of Mesopotamia and freeing Demetrius II who had been held in captivity, but he died in battle, leaving the throne open to more intrigue. <ref> Bryce, pgs. 212-13</ref>
[[File: Seleucids_92_BC.jpg|300px250px|thumbnail|rightleft|Map Showing the Final Extent of the Seleucid Empire]]
After Antiochus VII died, the throne basically passed to Cleopatra Thea, who killed her husband of the moment, Demetrius II, in order to place their son, Antiochus VIII (ruled 125-96 BC), on the throne. By then the Seleucid Empire descended into full-scale civil war and was a shadow of its former self, being reduced in area to Syria. <ref> Price, p. 367</ref> The Parthians were in firm control of Mesopotamia by the beginning of the first century BC, but the final blow came when Rome claimed the Levant in 64 BC, thereby extinguishing the Seleucid royal line. <ref> Bryce, p. 221</ref>
===Conclusion===
The Seleucid Empire was the greatest of the Hellenistic empires in terms of size and one of the most influential in terms of politics and culture. The early Seleucid kings expanded their already large empire by force to the east and west, played a major role in the power politics of the other Hellenistic kingdoms, and exported Greek-Hellenistic culture throughout Mesopotamia and the Near East. But as the Seleucids built their empire from the late fourth through the early second centuries BC, Rome and Parthia began challenging their hegemony in Mesopotamia and the Levant. Eventually, though, internal dissention and succession problems within the Seleucid royal house proved to be the catalyst that allowed the Romans and Parthians to partition the Seleucid Empire and add its territory to their growing empires.
===References===
