Sophocles was a Human writer.
In 2153, Captain Jonathan Archer provided the works of William Shakespeare and Sophocles to Drennik as examples of Earth literature. Drennik began reading Sophocles after finishing Shakespeare. (ENT episode: "Cogenitor") Archer later referred to how quickly Drennik read Sophocles' work to demonstrate how refined Vissian culture was. (ENT - The Romulan War novel: To Brave the Storm)