A book about memories of Constantine is also an album of memories for me. Earlier versions of parts of chapters were presented as the Moritz Lecture at Kalamazoo College, a plenary lecture at the annual conference of the North American Patristics Society, and a lecture at Calvin College. The most rewarding moments of those occasions were always the complementary conversations: with Anne Haeckl, John Wickstrom, and their students at Kalamazoo College; with Paul Blowers, Virginia Burrus, Elizabeth Digeser, David Hunter, Adam Schor, and Dennis Trout at NAPS; and with Young Kim, Mark Williams, and their students at Calvin College.

As an undergraduate and a graduate student I was blessed to enjoy the company and learning of wonderful professors. As a professor I continue to learn from the undergraduates in my survey courses and the graduate students in my seminars, who have become my most invigorating teachers. After his victory at the Milvian Bridge, the emperor Constantine relished arguing with bishops at their councils. He would likewise have enjoyed talking about late antiquity with Alex Angelov, Jon Arnold, and Rob Chenault, and with Ian Mladjov, who designed and drew the splendid maps.

Stimulating comments from Mark Humphries and the anonymous Press readers were helpful, encouraging, and much appreciated. Publishing with Cambridge University Press is a high honor; working with Beatrice Rehl, the best editor in academic publishing, is a delightful pleasure.