Lorenzo Valla, the Italian humanist, is best known as the man who exposed the Donation of Constantine and thus undermined a leading argument for papal sovereignty in the secular realm. This fact and the reputation for hedonism derived from his youthful work De Voluptate (On pleasure) have conspired to invest Valla with an air of disrepute that he probably does not deserve. In particular, this reputation does not do justice to Valla's efforts on behalf of a return to the spirit of the Gospel or to his respect for Paul and the early Greek and Latin Church Fathers, in which he clearly anticipates later developments. Nor does it recognize his passion for historical truth and for the defense of plain speaking against what he regarded as metaphysical obscurity and verbalizing. Valla was perhaps the most versatile of the humanists; he initiated a series of...