Sophocles was a renowned ancient Greek playwright, best known for his contributions to the development of dramatic literature and theater. He is considered one of the three great tragedians of classical Athens, alongside Aeschylus and Euripides, and his works played a pivotal role in shaping the structure and themes of Greek tragedy. His most famous plays include 'Oedipus Rex' and 'Antigone', which explore complex themes of fate, morality, and the human condition.