Ancient Greek literature
Seven works of Sophocles have survived, the most acclaimed of which are the three Theban plays, which center around the story of Oedipus and his offspring. The Theban Trilogy consists of "Oedipus the King", "Oedipus at Colonus", and "Antigone". Although the plays are often called a "trilogy," they were actually written many years apart. "Antigone", the last of the three plays sequentially, was actually first to be written, having been composed in 441 BC, towards the beginning of Sophocles's career. "Oedipus the King", the most famous of the three, was written around 429 BC at the midpoint of Sophocles's career. "Oedipus at Colonus", the second of the three plays chronologically, was actually Sophocles's last play and was performed in 401 BC, after Sophocles's death.
Sophocles
Among Sophocles' earliest innovations was the addition of a third actor, which further reduced the role of the chorus and created greater opportunity for character development and conflict between characters. Aeschylus, who dominated Athenian playwriting during Sophocles' early career, followed suit and adopted the third character into his own work towards the end of his life. Aristotle credits Sophocles with the introduction of "skenographia", or scenery-painting. It was not until after the death of the old master Aeschylus in 456 BC that Sophocles became the pre-eminent playwright in Athens.