Dax was a Trill man, a host of the Dax symbiont and Starfleet ensign.

In the 2260s, Dax was assigned to the USS Constellation. On one mission, Dax was assigned to take a commodore to his court martial, but en route the shuttle Twain crashed on a planet near the Romulan Neutral Zone. When a Romulan ship answered the distress call, Dax tried to pretend the Commodore was a lieutenant, worried Pakel might take him prisoner due to his rank. Pakel allayed Dax's fears, saying he would not take an old man like the Commodore prisoner and hoped trust could be built between the Federation and the Romulan Empire. Ensign Dax quickly came to respect Pakel, a respect Jadzia Dax recalled long after Pakel was dead. (DS9 - Hearts and Minds comic: "Masters of War")

Like Enjana Dax and Penzak Dax, episodes of DS9 like "Facets" and "Trials and Tribble-ations" contradict the existence of this character.
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