Mathematician Michael Lambrou , Associate Professor at the University of Crete, forewords.

It is generally accepted that Proclus ' most important work is the "Commentaries on the first book of Euclid ", since it provides much information on the history of geometry. The numerous and sometimes extensive references to mathematical views and mathematical realizations of earlier mathematicians made Proclus ' "Memorandum" an invaluable source of information on geometry and its workers during the previous 10 centuries. This is because Proclus had at his disposal many historical and critical works, which have been lost. The historical diagram drawn by Proclus in the evolution of Greek geometry was the framework within which all subsequent historians of this period moved.

But it is not only the historical information that is richly derived from the Commentaries of Proclus . Equally valuable are the elements of philosophy contained in the first part of the work.