The Trelonians were a species.

Sometime prior to 2370, the Trelonian General Yiri had his brother executed because he allegedly was a traitor to the Trelonian government, though according to Doctor Bashir the evidence was only circumstantial. (DS9: "Profit and Loss")

This species was only mentioned in dialogue.
According to, the Trelonians hailed from the planet Trelonia.
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