Antigonus II Gonatas defeated Ptolemy II's fleet at Cos, a victory that may have weakened Ptolemaic naval dominance in the Aegean.
Key Facts
- Approximate date
- c. 261 BC (range: 262–256 BC)
- Victorious commander
- Antigonus II Gonatas
- Probable Ptolemaic commander
- Patroclus, admiral of Ptolemy II
- Post-battle dedication
- Antigonid flagship dedicated to Apollo
- Possible Nike of Samothrace occasion
- One of three proposed candidate battles
Location
Cause → Event → Consequence
The Hellenistic successor kingdoms of Macedon and Egypt competed for naval supremacy in the Aegean during the mid-third century BC. Ptolemaic control over Aegean islands and sea routes presented a direct challenge to Antigonid power, setting the stage for armed confrontation between their respective fleets.
Around 261 BC, an Antigonid fleet commanded by Antigonus II Gonatas engaged a Ptolemaic fleet, possibly under admiral Patroclus, near the island of Cos. Antigonus achieved a clear victory in the engagement, demonstrating Macedonian naval capability against Ptolemaic forces.
After the battle, Antigonus II dedicated his flagship to Apollo as a gesture of thanksgiving. The victory has long been assumed to have significantly damaged Ptolemaic influence in the Aegean, though this interpretation has been contested by modern scholars. Some researchers also propose the battle as the occasion for the erection of the Nike of Samothrace statue.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Antigonus II Gonatas.
Side B
1 belligerent
Patroclus (probable).