To his contemporaries, Odo of Tournai--master of the cathedral school of Tournai, first abbot of the restored monastery of St. Martin of Tournai, and, later, Bishop of Cambrai--was one of the most illustrious teachers and philosophers in Christendom. Yet only one of his works, a treatise on the Mass, has heretofore been translated into English. Irven M. Resnick here provides the first English-language translation of two of Odo's other works. The first, On Original Sin, is at once an exposition of Christian doctrine and a philosophical investigation into the origin of the soul, the...