We know much about the Italian city states-the "communes"-of the twelfth and thirteenth centuries. But historians have focused on their political accomplishments to the exclusion of their religious life, going so far as to call them "purely secular contrivances." When religion is considered, the subjects are usually saints, heretics, theologians, and religious leaders, thereby ignoring the vast majority of those who lived in the communes. In Cities of God, Augustine Thompson gives a voice to the forgotten majority-orthodox lay people and those who ministered to them. Thompson positions the Italian republics in sacred space and time. He maps their religious geography as it was expressed through political and voluntary associations, ecclesiastical and civil structures, common ritual life, lay saints, and miracle-working shrines. He takes the reader through the rituals and celebrations of the communal year, the people"s corporate and private experience of God, and the "liturgy" of...