"Clearly written and thoroughly researched, this fine study deserves wide reading by medievalists and their students."--Choice In 1399 a wave of popular devotion swept through Italy, and people joined in pious processions lasting nine days. Dubbed "Bianchi" because of their white robes, they listened to sermons, sang hymns, and prayed for "peace and mercy." Bornstein reconstructs this history in unparalleled detail, offering new insight into the character of late medieval Christianity.