This history of early Christian creeds contains an up-to-date account of their origin and development from the credal texts in the New Testament to the fully fledged classical formulae of the 4th century. It includes the creeds' use and alteration in subsequent periods until the time of Charlemagne and the beginnings of the filioque controversy. In addition, the author provides a scholarly commentary on the most common ancient confessions: the Nicene Creed and the Apostles' Creed. Going beyond previous studies, the book contains chapters dedicated to the use of creeds in law, art, music, everyday life and even magic. Recently discovered source texts, such as a new Ethiopic version of the Roman Creed and a short recension of the Creed of Nicaea-Constantinople, receive extensive treatment. Credal developments in the eastern churches beyond the borders of the Roman Empire complete this comprehensive overview. This volume is intended both as a textbook for advanced students of theology and cognate disciplines and as a reference book on the creeds in a wide range of contexts. All source texts are accompanied by modern English translations. Winner of the Alberigo Award 2024 awarded by the European Academy of Religion.