The Battle of Ancyra (235 BC): A Significant Episode in the War of the Brothers
The Battle of Ancyra, which took place in 235 BC, is a notable chapter in the history of the Seleucid Empire. It was part of the broader conflict known as the War of the Brothers—a power struggle between the two sons of Seleucus II Callinicus, Seleucus III and Antiochus Hierax. The battle itself, which occurred near the region of modern-day Ankara, Turkey, was pivotal in shaping the political landscape of the Seleucid dynasty, contributing to Antiochus Hierax’s rise and Seleucus III’s eventual downfall. Understanding the battle involves exploring its context, participants, and its long-term effects on both the Seleucid Empire and the ancient world.
Background: The War of the Brothers
The War of the Brothers was a civil conflict within the Seleucid Empire, which had been struggling with internal fragmentation and external threats. Seleucus II Callinicus, the reigning king of the Seleucid Empire, died in 246 BC, leaving two sons—Seleucus III and Antiochus Hierax—to inherit his vast territory.

Upon his father’s death, Seleucus III ascended to the throne. However, his rule was marked by weakness and instability, which stemmed from both internal dissent and external challenges. Meanwhile, Antiochus Hierax, the younger brother, had his own ambitions. As a result, a fierce rivalry developed between the two brothers, exacerbating the internal conflict within the Seleucid Empire. Each brother sought to secure the throne for themselves, leading to an all-out war.
The Strategic Importance of Ancyra
The Battle of Ancyra took place near the city of Ancyra, which is present-day Ankara in Turkey. Ancyra was strategically located in central Anatolia, making it an important crossroads between various territories in the eastern Mediterranean. The city’s position was key to controlling trade routes and military access to Anatolia, which were crucial for the broader geopolitical stability of the Seleucid Empire.
In the context of the War of the Brothers, Ancyra was a focal point in the struggle for control over Anatolia. Whoever controlled this region could potentially dominate not just the Seleucid Empire’s western provinces, but also gain a tactical advantage over rivals. This made Ancyra an ideal location for a decisive confrontation between the brothers.
The Participants: Antiochus Hierax vs. Seleucus III
The battle itself saw the forces of Antiochus Hierax clash with those of his older brother Seleucus III. Antiochus Hierax, despite being younger, had a more capable military command, and his forces were better prepared for the confrontation. Antiochus was known for his strategic acumen and ability to win over allies, while Seleucus III’s leadership was marked by indecision and a lack of effective coordination among his forces.
The battle, though not extensively documented in ancient sources, is generally understood to have been a land-based confrontation, which resulted in a decisive victory for Antiochus Hierax. This victory helped solidify his position as a contender for the throne and marked a significant defeat for Seleucus III, who was left in a precarious political and military situation.
The Outcome: Antiochus Hierax Emerges Victorious
The battle ended with Antiochus Hierax emerging victorious. Seleucus III’s forces were routed, and the defeat dealt a severe blow to his position as the legitimate ruler of the Seleucid Empire. Following the defeat, Seleucus III would ultimately lose control over key regions of the empire, while Antiochus Hierax continued to assert his claim to the throne.
The victory at Ancyra was a pivotal moment for Antiochus Hierax. It not only confirmed his military superiority but also allowed him to gain the loyalty of various factions within the empire. However, despite his success in the Battle of Ancyra, Antiochus Hierax would face further challenges in his quest for the throne, as other political factions within the Seleucid Empire continued to vie for control.
The Aftermath: Impact on the Seleucid Empire
The War of the Brothers and the Battle of Ancyra had long-lasting consequences for the Seleucid Empire. While Antiochus Hierax’s victory secured him temporary control over large parts of the empire, the civil war had already weakened the Seleucid state. The empire, once a dominant power in the Hellenistic world, would struggle for years to regain its former glory.
In the aftermath of the war, Seleucus III’s defeat and eventual death signaled a shift in the power dynamics of the Seleucid Empire. Antiochus Hierax’s rise, though significant, did not result in a unified empire. The Seleucid state would continue to experience internal strife and fragmentation in the years following the Battle of Ancyra, eventually leading to its decline.
Conclusion
The Battle of Ancyra (235 BC) remains an important event in the history of the Seleucid Empire and the larger Hellenistic world. The battle, part of the War of the Brothers, was crucial not only in the short-term military struggle between Antiochus Hierax and Seleucus III, but also in the long-term political disintegration of the Seleucid dynasty. Although Antiochus Hierax emerged victorious, the cost of civil war and the ongoing internal challenges within the empire would limit the full impact of his triumph. The battle itself, fought near the ancient city of Ancyra (modern-day Ankara), serves as a reminder of the complex dynamics of power, rivalry, and succession within ancient empires.