T'Les was a Vulcan who worked as an instructor at the Vulcan Science Academy in the early 22nd century.
T'Les and her husband had met only once prior to their bonding and marriage. However, even though they were strangers at the time of their marriage, they grew to love and care for each other deeply. (ENT: "Home") In 2088, T'Les and her husband had their only child, a daughter named T'Pol who later became a sub-commander in the Vulcan High Command and was assigned to the NX-class starship Enterprise NX-01 in 2151. (ENT: "Zero Hour") T'Les became a widow when her husband, and T'Pol's father, died sometime prior to 2151. (ENT: "The Xindi")
T'Les notified T'Pol that she had "retired" from her teaching position at the Science Academy. In reality, because of her daughter's actions on P'Jem in 2151, T'Les had been under investigation for removing classified material from the Science Academy, and had been forced into an early retirement due to the falsified charges. T'Pol finally married Koss, which put an end to to the investigation and allowed T'Les to be reinstated. (ENT: "Home")
T'Les later joined a group of Vulcan dissidents known as Syrrannites, who were vulnerable to arrest after they supposedly destroyed the United Earth Embassy. After Archer and T'Pol were captured by the Syrrannites, T'Les came to their aid and persuaded T'Pau, the head of the movement, to trust them. T'Les advised T'Pol that the Vulcan High Command was corrupt and evil. She died in her daughter's arms when the High Command bombarded the Syrrannites' compound – the T'Karath Sanctuary in Vulcan's Forge. In her last moments, she expressed her pride in and love for her daughter and said that she had joined the Syrranites to find Surak's original writings, in part, to help T'Pol who had always struggled with her emotions. (ENT: "Awakening")
