This book presents a ground-breaking exposition of Anaxagoras' legacy to Classical and Late Antiquity, critically assessing Aristotle's distorted representation of Anaxagoras. Origen, formerly a Greek philosopher of note, is placed in the history of philosophy for the first time. Byemphasizing his Anaxagorean background, and being the first to revive the Anaxagorean Theory of Logoi, Origen paved the way to Nicaea.