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Doyos was a 24th century Trill man who held the rank of captain in the Trill Defense Ministry in the 2370s decade.
In early October of the year 2376, Captain Doyos was the commanding officer of a military presence defending the Caves of Mak'ala from neo-Purist rioters. When General Taulin Cyl and Ezri Dax arrived in the runabout USS Rio Grande, Doyos reported their status to the general. (DS9 - Worlds of DS9 - Volume Two novel: Trill: Unjoined)