Poetics by Aristotle (384 BCE - 322 BCE)

Aristotle’s Poetics from the 4th century B.C. aims to give a short study of storytelling. It discusses things like unity of plot, reversal of situation, and character in the context of Greek tragedy, comedy and epic poetry. But it still applies today. It is especially popular with screenwriters as seen in many script gurus’ how-to books.
(Summary by Robert Foster)