Among the achievements of modern historical criticism Valla’s work was a conspicuous pioneer. Its quality and its importance have often been exaggerated, and as often underestimated. It is some satisfaction to make it more generally available in the original text and translation, so that the reader may judge for himself. A critical appraisal would have to take into account that Nicholas Cusanus some seven years earlier in his De concordantia catholica covered part of the same ground even better than Valla did, and anticipated some of his arguments. But Valla’s treatise is more exhaustive, is in more finished and effective literary form, and in effect established for the world generally the proof of the falsity of the Donation. Moreover, for the first time, he used effectively the method of studying the usage of words in the variations of their meaning and application, and other devices of internal criticism which are the tools of historical criticism to-day. So, while Valla’s little book may seem slight beside later masterpieces of investigation and beside systematic treatises in larger fields, it is none the less a landmark in the rise of a new science. I speak from personal experience in adding that it is still useful in college classes in promoting respect for, and development in, critical scholarship. As to Valla himself the words of Erasmus will bear repetition; “Valla, a man who with so much energy, zeal and labor, refuted the stupidities of the barbarians, saved half-buried letters from extinction, restored Italy to her ancient splendor of eloquence, and forced even the learned to express themselves henceforth with more circumspection.”[2] The Italian Renaissance is much extolled among us,—and so little known. A short time ago diligent search revealed no copy of Valla’s works in the United States, and many of the larger libraries had none of his separate writings. The same is doubtless true in the case of other great names in the Renaissance. Meanwhile, there are those whose profession it is to teach European history and who are utterly unacquainted with medieval and later Latin. The best life of Valla is that by Girolamo Mancini.[3] There is no satisfactory account of him in English. Valla wrote his Discourse on the Forgery of the alleged Donation of Constantine (Declamatio de falso credita et ementita donatione Constantini, also referred to as Libellus, and Oratio) in 1440, when he was secretary to Alfonso, king of Aragon, Sicily, and Naples. It may well be considered as part of the campaign which that king was conducting against Pope Eugenius IV in furtherance of his claims to Italian territories.