Gydian was a male Dopterian. In 2385, Gydian and his business partner HoJahn travelled to Deep Space 9, where they stole the Scroll of the Ferengi Rules of Acquisition. The scroll turned out to be fake, as, if it had been the original scroll, the latinum writing would have impurities and be worth practically nothing. Gydian and HoJahn were identified as likely culprits by Odo and Jefferson Blackmer. (DS9 eBook: Rules of Accusation)