The Rhetorica ad Herennium is the oldest Latin handbook of rhetoric to survive, and the Middle Ages read it under Cicero’s name. It stands at Book I, chapter 2, where the author turns to the orator’s tasks, each given its definition. The list of “invention, arrangement, style, memory, delivery” became the order in which the later handbooks and schools set out the art.
Read in contextThe orator, then, must have invention, arrangement, style, memory, delivery. Invention is the devising of matters true, or like the truth, that make the cause probable. Arrangement is the order and distribution of matters, showing what is to be placed in which positions. Style is the adaptation of suitable words and sentences to the matter invented. Memory is the firm hold of the mind on matters, words and arrangement. Delivery is the graceful control of voice, countenance and gesture.
