This is a survey of the development of the Paschal rites and customs of the ancient Church, from apostolic times to the end of the age of persecution, as a background and context for understanding the outline and basic theme of Revelation. Christian interpreters in all ages have sought a clue to the "New Testament Book of Revelation". In this study, Massey H. Shepherd offers a new approach to the basic structure of the Book. He surveys the development of Paschal rites and customs of the ancient Church, from apostolic times to the end of the age of persecution, as a background and context for understanding the outline and basic theme of Revelation. Fresh perspectives are opened to students of New Testament and early Christian literature, the liturgy and piety of the primitive Church, and the origins of the Christian Year.