Pope Urban II's Council of Piacenza covers an important period of medieval history: the so-called "Gregorian Reform" (roughly between 1050-1130), and one of the most important popes of the Middle Ages, Urban II (1088-99).

This book deals with the Iecur Placentinum, the bronze model of a sheep’s liver, bearing 42 Etruscan inscriptions. The Piacenza Liver is a highly interesting document of the utmost importance for the understanding of Etruscan religion. It will appear that the network with the inscribed names of divinities on both sides of the Liver depicts a microcosmos reflecting the macrocosmos, the Etruscan division of heaven.