Atlas of Battles

naval engagement, notable, ancient

Battle of Cos

Battle of Cos was a naval engagement fought in 255 BC at Kos, in what is now Greece. It was part of the Chremonidean War, which ran from 267 BC to 261 BC. The recorded result: Macedonian victory.

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A cropped view of the original showing the Dodecanese group of Greek islands and the coast of Turkey. Further information and the original downloads can be found at http://visibleearth.nasa.gov/view.p
A cropped view of the original showing the Dodecanese group of Greek islands and the coast of Turkey. Further information and the original downloads can be found at http://visibleearth.nasa.gov/view.p. Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC, Public domain, via Wikimedia Commons.
Fought255 BC
WhereKos, Greece36.850N, 27.233E
OutcomeMacedonian victory
BelligerentsAntigonid MacedoniaagainstPtolemaic Egypt
Part ofChremonidean War267 BC to 261 BC

Record

Date255 BC (year precision)
PlaceKos, Greece
36.850N, 27.233E
KindNaval engagement, ancient
Commanders
  • Antigonus II Gonatas
  • Patroclus (admiral)
  • Ptolemy II
Battle of CosBattle of CosBattle of KosBattle of CnidusSiege of HalicarnassusBattle of GerontasBattle of LerosBattle of KosBattle of CnidusSiege of HalicarnassusBattle of GerontasBattle of LerosDenizliSökeRodosAydın100 km36.850N, 27.233E
The recorded site, with the nearest other engagements in the atlas. Present-day coastlines, rivers and borders; towns from Natural Earth.

Nearest engagements

Elsewhere in 255 BC

Battle of Cos is one of 193 engagements of the 3rd century BC in the atlas and one of 529 in present-day Greece.

Sources

Identity, coordinates, dates and the war from Wikidata Q3235767, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Battle of Cos, revision 1370437707, read 2026-11-14, licensed CC BY-SA 4.0; the article's text is not reproduced here. Present-day country and state from Natural Earth. Dates before 1582 follow the Julian calendar as recorded.