coinage of Antiochus IV, depicting a victorious galley.
Background (195–170 BC) The Seleucids had little desire to entangle themselves in a new war with the Ptolemies. After losing the
Roman-Seleucid War, they were forced to pay a huge indemnity that the Roman Republic imposed on them at the
Treaty of Apamea in 188 BC. They already controlled Coele-Syria, and were busy with fending off the rising
Parthian Empire in the East. Internal dissent and rebellions weakened the Ptolemies over time. In particular, the power of the monarchy waned, and the influence of aristocrats of high standing in Alexandria grew, as did the power of Egyptian nativist movements. Ptolemy V seemed to possibly be intending to raise funds to finance an attempt to reclaim Coele-Syria, but died unexpectedly in 180 BC; in the paranoid atmosphere of the era, many assumed he had been poisoned, perhaps by courtiers who wished to keep the peace and avoid taxes or levies to finance a war, or because they preferred a young king and regent who would be easier to manipulate. Cleopatra, the regent, favored the peace faction at court, whether because she agreed a war made no sense, or because of lingering loyalties to the Seleucid royal family she descended from. Cleopatra I died in 176 BC, but her eldest son
Ptolemy VI Philometor was still only 10 years old, necessitating a continued regency. Eulaeus and Lenaeus, a eunuch and a slave, became the two regents of the young king of Egypt, likely as a compromise between the relevant Egyptian factions who could not bear to see a rival on the throne who might have the backing and lineage to claim it themselves. Under the regents, the young Ptolemy VI was married to his sister
Cleopatra II and she was declared a co-ruler.
Sixth War The causes of the new conflict are obscure. Relations declined between the two powers, with both sending emissaries to Rome (then bogged down in the
Third Macedonian War) asking for military support against the other before the war even started. In 170 BC, Ptolemy's younger sibling
Ptolemy VIII Physcon was declared a co-ruler as well in order to bolster the unity of Egypt; the three siblings ranged from 10 to 16 years of age. While the causes are still not entirely clear, Ptolemaic regents Eulaeus and Lenaeus seem to have instigated the formal declaration of war on Seleucid ruler
Antiochus IV Epiphanes. This was possibly out of a desire to find a unifying issue to rally the state around, possibly due to political gains in the pro-war faction, and likely influenced by a vast misunderstanding of how easy it would be to win such a war. Antiochus IV had gotten word of Egyptian preparations for war and was in
Tyre in July and August 170 BC preparing his forces, and reached the important strategic town of
Pelusium in November 170 BC. Just as the Ptolemaic army moved out of Pelusium to begin its invasion of Coele-Syria, the Seleucids defeated the Ptolemaic army in the Sinai desert, perhaps due to Egyptian surprise at the Seleucids being ready to fight immediately. Ptolemaic losses mounted as they retreated to Pelusium, but Pelusium quickly fell with little loss of life and a surrender of the Ptolemaic army. Pelusium was the gateway to the rest of Egypt; with it under control, Seleucid supply lines were secure, and Egypt was in grave danger. Antiochus took
Naucratis and camped near Alexandria, potentially threatening a siege. The Egyptians suffered internal unrest over the poor progress of the war: Eulaeus and Lenaeus were overthrown and replaced by two new regents, Comanus and Cineas. Envoys were sent to negotiate a peace treaty. Antiochus took Ptolemy VI (who was his nephew) under his guardianship, perhaps with the intent of making Egypt a
client state subordinate to Seleucid power. Archaeological records show that even Thebes in the southern part of Egypt were occupied by a foreign army (surely the Seleucids) in October 169 BC. However, this occupation was unacceptable to the people of Alexandria who responded by proclaiming Ptolemy Physcon as sole king. Antiochus besieged Alexandria but he was unable to cut communications to the city so, in late autumn of 169, he withdrew his army, leaving Ptolemy VI as a rival king in Memphis. Antiochus possibly withdrew to deal with problems in
Phoenicia at home. In Antiochus's absence, Ptolemy VI and his brother Ptolemy Physcon were reconciled, possibly after a brief civil struggle. Antiochus, angered at his loss of control over the king, invaded again in 168 BC. The Egyptians sent to Rome asking for help and the Senate dispatched
Gaius Popilius Laenas to Alexandria. Meanwhile, a Seleucid fleet seized
Cyprus, and Antiochus's army took
Memphis again. While at Memphis, he even issued an official decree as Egyptian king. The Ptolemaic armies failed to offer any major field battles, instead staying fortified in garrisons. Antiochus was now prepared to march on the capital of Alexandria again. At Eleusis, on the outskirts of Alexandria, he met Popilius Laenas, with whom he had been friends during his stay in Rome. But instead of a friendly welcome, Popilius offered the king an ultimatum from the Roman Senate: he must evacuate Egypt and Cyprus immediately. Rome had only just recently defeated the Macedonians at the
Battle of Pydna, potentially freeing up armies with which it could credibly threaten the Seleucids. Antiochus begged to have time to consider but Popilius drew a circle round him in the sand with his cane and told him to decide before he stepped outside it. Antiochus chose to obey the Roman ultimatum to avoid a new
Roman–Seleucid War, a retreat that
Polybius described as personally humiliating for Antiochus. The "Day of Eleusis" ended the Sixth Syrian War and Antiochus' hopes of conquering Egyptian territory. Still, the Ptolemies were greatly weakened by the war as well as the conflict between Ptolemy VI and VIII. A rebel named Dionysus Petrosarapis would attempt to exploit the animosity between the two Ptolemy brothers and start a series of revolts from 168–164 BC. == Ptolemy VI's intervention in the Seleucid Dynastic Wars ==