Aristotle (384-322 BC), the great Greek thinker, researcher, and educator, ranks among the most important and influential figures in the history of philosophy, theology, and science. He joined Plato's Academy in Athens in 367 and remained there for twenty years. After spending three years at the Asian court of a former pupil, Hermeias, he was appointed by Philip of Macedon in 343/2 to become tutor of his teenaged son, Alexander. After Philip's death in 336, Aristotle became head of his own school, the Lyceum at Athens, whose followers were known as the Peripatetics. Because of anti-Macedonian feeling in Athens after Alexander's death in 323, he withdrew to Chalcis in Euboea, where he died in 322. Aristotle wrote voluminously on a broad range of subjects analytical, practical, and theoretical. Rhetoric, probably composed while he was still a member of Plato's Academy, is the first systematic approach to persuasive public speaking based in dialectic, on which he had recently written the first manual. This edition of Aristotle's Rhetoric, which replaces the original Loeb edition by John Henry Freese, supplies a Greek text based on that of Rudolf Kassel, a fresh translation, and ample annotation fully current with modern scholarship.

Cicero (Marcus Tullius, 10643 BCE), Roman lawyer, orator, politician and philosopher, of whom we know more than of any other Roman, lived through the stirring era which saw the rise, dictatorship, and death of Julius Caesar in a tottering republic. In his political speeches especially and in his correspondence we see the excitement, tension and intrigue of politics and the part he played in the turmoil of the time. Of about 106 speeches, delivered before the Roman people or the Senate if they were political, before jurors if judicial, 58 survive (a few of them incompletely). In the fourteenth century Petrarch and other Italian humanists discovered manuscripts containing more than 900 letters of which more than 800 were written by Cicero and nearly 100 by others to him. These afford a revelation of the man all the more striking because most were not written for publication. Six rhetorical works survive and another in fragments. Philosophical works include seven extant major compositions and a number of others; and some lost. There is also poetry, some original, some as translations from the Greek.

The Loeb Classical Library edition of Cicero is in twenty-nine volumes.