Battle of Cos

The Battle of Cos was fought ca 258 BC between an Antigonid fleet and a Ptolemaic fleet. Antigonus II Gonatas led his forces to victory over Patroclus, admiral of Ptolemy II. It has been widely assumed that the battle severely damaged Ptolemaic control of the Aegean. After the battle, Antigonus dedicated his flagship to Apollo.

The date of the battle is uncertain, although it must fall within the period 262-256 BC. Hammond dates it as late as 255 BC.

It is possible that this is the victory which the Nike or Winged Victory of Samothrace commemorates.