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The USS Cydonia was a Federation starship in Starfleet service in the 24th century, commanded by Pavel Chekov. This vessel was named for the region Cydonia on the planet Mars.
After his retirement as commander-in-chief of Starfleet, Admiral Chekov, wrote books detailing his adventures on the Enterprise, Potemkin, and the Cydonia. (TOS novel: The Return)