Cytorus (Greek Κύτωρος, Kytoros; also Cytorum, Κύτωρον, Kytoron and Κύτωρις) was an ancient Greek city on the northern coast of Asia Minor. Mentioned by Homer, Cytorus survives in the name of Gideros, which is both
Its mythical founder was Cytiorus, son of Phrixus, according to Ephorus and Stephanus of Byzantium. In giving the Trojan battle order in Book 2 of the Iliad, Homer mentions Cytorus and Sesamon as Paphlagonian settlements, along with others around the river Parthenius, today's Bartın River. Sesamon is today's Amasra. This town was Amastris for Strabo, who writes of its founding through a union of Cytorus, Sesamon, and two other settlements. He reports that Cytorus was an emporium of Sinope and was a source for boxwood. He derives the name of Cytorus (he uses the neuter Cytorum) from Cytorus, a son of Phryxus and therefore one of the Argonauts.
In the Argonautica, Apollonius of Rhodes mentions the settlement of Cytorus and related places in describing the voyage of the Argo. Unlike Strabo, he does not mention Cytorus as a son of Phryxus. Apollonius does apparently place Cytorus where Gideros Bay is today, between the Bartın River and the city of Sinop.
Apollonius applies the epithet "woody" to Cytorus, alluding to the boxwood that Strabo mentions. In the 4th of the Carmina, Catullus addresses "Box-tree-clad Cytórus", while in the Georgics, Virgil says, "Fain would I gaze on Cytorus billowy with boxwood". The Homeric commentator Eustathius of Thessalonica mentions a saying, "carry boxwood to Cytorus," with the meaning of "carry coals to Newcastle".
There is also reported a folk etymology for the modern name of Gideros, based on its resemblance to the Turkish gideriz (we go). Villagers say that Roman ships once sought shelter from a storm at Gideros Bay, and when the villagers asked the sailors if they would stay, the sailors replied, "Kalamazsak, gideros"—If we can't stay, we go. Pleased at the prospect of not having the Romans around, the villagers called the bay Gideros.
And the Paphlagonians did Pylaemenes of the shaggy heart lead from the land of the Eneti, whence is the race of wild she-mules. These were they that held Cytorus and dwelt about Sesamon, and had their famed dwellings around the river Parthenius and Cromna and Aegialus and lofty Erythini.
The reference, along with the references below to Strabo and Apollonius of Rhodes, is given in the cited work of Umar.
After the Parthenius River, then, one comes to Amastris, a city bearing the same name as the woman who founded it. It is situated on a peninsula and has harbors on either side of the isthmus. Amastris was the wife of Dionysius the tyrant of Heracleia and the daughter of Oxyathres, the brother of the Dareius whom Alexander fought. Now she formed the city out of four settlements, Sesamus and Cytorum and Cromna (which Homer mentions in his marshalling of the Paphlagonian ships) and, fourth, Tieium. This part, however, soon revolted from the united city, but the other three remained together; and, of these three, Sesamus is called the acropolis of Amastris. Cytorum was once the emporium of the Sinopeans; it was named after Cytorus, the son of Phryxus, as Ephorus says. The most and the best box-wood grows in the territory of Amastris, and particularly round Cytorum.
And lo, they passed by the stream of Parthenius as it flows into the sea, a most gentle river, where the maid, daughter of Leto, when she mounts to heaven after the chase, cools her limbs in its much-desired waters. Then they sped onward in the night without ceasing, and passed Sesamus and lofty Erythini, Crobialus, Cromna and woody Cytorus. Next they swept round Carambis at the rising of the sun, and plied the oars past long Aegialus, all day and on through the night.