This edition contains a translation of Book 1 of the Commentary on Timaeus by Proclus Diadochus of Lycia, Athenian Neoplatonist of the 5th century AD e. (412-485). The book is a line-by-line commentary on the dramatic initiation of the Platonic dialogue of Timaeus (17a-27b), which includes a brief retelling of the dialogue of the State and the story of Atlantis. Defining Timaeus's subject as "the universal teaching of nature," Proclus interprets the dramatic beginnings of dialogue as an allegorical narrative of the causes and structure of the physical cosmos, which precedes scientific consideration of nature with its figurative and symbolic description.