Following the work of Harold J. Berman on the history of law, Nemo holds that the Gregorian Reform and the broader “Papal Revolution” of the eleventh to thirteenth centuries are the locus of the real synthesis of Athens, Rome, and Jerusalem. The result is a new weltanschauung in which Greek science and Roman law are thereafter put to work within History. Thus, during this period, the Catholic Church replaces the Augustinian theology of original sin with Anselm’s doctrine of free will and later introduces the doctrine of the purgatory.