Book excerpt: The fifteenth century was a critical juncture for the College of Cardinals. They were accused of prolonging the exile in Avignon and causing the schism. At the councils at the beginning of the period their very existence was questioned. They rebuilt their relationship with the popes by playing a fundamental part in reclaiming Rome when the papacy returned to its city in 1420. Because their careers were usually much longer than that of an individual pope, the cardinals combined to form a much more effective force for restoring Rome. In this book, shifting focus from the popes to the cardinals sheds new light on a relatively unknown period for Renaissance art history and the history of Rome. Dr. Carol M. Richardson has been awarded the Philip Leverhulme Prize (2008) in the field of History of Arts.