Symplegades

the `Clashing Rocks.’

Two rocks on either side of the northern entrance of the Thracian Bosphorus, leading into the Euxine (Black) Sea. Also known as the Cyanean (Blue) Rocks, they were believed to have clashed together, from time to time, with enormous force when driven by the wind. According to Greek myth, they prevented ships from entering the Euxine Sea until the Argo, the vessel of the Argonauts, made the passage successfully, with the help of the goddess Athena and the Thracian King Phineus, who had advised them to test the rocks by seeing if a dove could fly between them before their moment of impact. The dove got through, and so did the Argo. Thereafter the Symplegades remained stationary for evermore.

A similar story was told of the Planctae (Wandering Rocks), which were sometimes identified with the Symplegades and may have been their older name. According to Homer's Odyssey, on the other hand, Odysseus encountered Planctae in another region altogether, that is to say north of Sicily—the poet had Strongyle (Stromboli) and Strombalicchio in mind, according to a modern suggestion—and chose, on Circe's advice, to steer clear of them, preferring to brave the terrors of Scylla and Charybdis instead; while Apollonius Rhodius describes the Argo as passing between both the Symplegades (of the Bosphorus) and the Planctae (off Sicily), with the assistance not of Athena but of Hera.