General Ardelon Tandro was a revered military leader of Klaestron IV whose death thirty years earlier leads to Jadzia Dax being accused of treason and murder on behalf of Curzon Dax.
Ardelon Tandro is never seen, but his reputation drives the first-season episode Dax. During the civil war on Klaestron IV he commanded the government's forces, and was killed by the rebels after a transmission gave away his position. His death rallied his side to victory and statues were raised to him across the planet.
Three decades later his son, Ilon Tandro, concludes that only Curzon Dax, then the Federation mediator and a close friend of the general, could have sent the message, and seeks to extradite Jadzia.
The truth comes from the general's widow, Enina. Curzon could not have sent the signal because he was with her at the time. It is implied that Tandro himself was the traitor, attempting to deal with the rebels, who killed him anyway. Enina kept silent to preserve the legend.