""Altertum, Mittelalter Und Neuzeit In Der Kirchengeschichte: Ein Beitrag Zum Problem Der Historischen Periodisierung"" is a book written by Karl Heussi in 1921. The book focuses on the problem of historical periodization in the study of church history. Heussi examines the different periods of church history, including ancient times, the Middle Ages, and the modern era, and discusses the challenges of dividing history into distinct periods. Heussi...