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.
Eupolis
Based on the primary sources above, modern historians conclude that Eupolis debuted in the 420s BC, probably in 429 BC. His first production was probably at the Lenaia, the lesser theatrical festival of his time. The Lenaia are thought to have allowed novices to compete, so they could prove themselves before presenting plays at the Dionysia festival. His first known play was either "Prospaltioi" or "Heilotes". Surviving fragments from the "Prospaltioi" include allusions to, and near-quotations of, Sophocles' "Antigone" (442 BC). Scholars are convinced the play targeted Pericles, due to a famous reference to Aspasia. This makes it likely that Pericles, who died in 429 BC, was still alive when Eupolis was working on the text.