Home to a large statue of the god Poseidon, the island possessed also a temple dedicated to him, and was named after his son Triton. In 5th century BCE, the ruins of the temple were overrun by a pack of lions.
During the Peloponnesian War, the Spartan misthios Kassandra visited the island while hunting for a Makedonian bracelet for the pirate queen Xenia. Instead of the bracelet, Kassandra found Poseidon's Trident. In addition to the lions, she also discovered that guards loyal to the Cult of Kosmos had set up a camp on the island's northern shore.