A new critical edition (the first since 1864) of Proclus' Commentary on Plato's Parmenides. Proclus' work is the most important document on the interpretation of this enigmatic dialogue, and has had a crucial influence on all subsequent readings. This volume contains Books IV and V. - ;The Commentary on Plato's Parmenides by Proclus (AD 412-85) is the most important extant document on the interpretation of this enigmatic dialogue, and has had a crucial influence on all subsequent readings. In Proclus' Commentary, the Parmenides provides the argumentative and conceptual framework for a scientif