This is the first English translation of Proclus' commentary on Plato's
Parmenides. Glenn Morrow's death occurred while he was less than halfway through the translation, which was completed by John Dillon. A major work of the great Neoplatonist philosopher, the commentary is an intellectual tour de force that greatly influenced later medieval and Renaissance thought. As the notes and introductory summaries explain, it comprises a full account of Proclus' own metaphysical system, disguised, as is so much Neoplatonic philosophy, in the form of a commentary.

Few now would turn to the commentary of Proclus, head of the Academy in the fifth century A,D. primarily in order to understand Plato. Nevertheless, the work is of great importance for the light it sheds on the interpretation of the dialogue
by Proclus and his predecessors.... [Scholars] have increasingly devoted attention to the way in which elaboration of the Neoplatonic metaphysical system went hand in hand with more and more complex interpretations of the hypotheses of Parmenides 137ff.