""Altertum, Mittelalter Und Neuzeit In Der Kirchengeschichte: Ein Beitrag Zum Problem Der Historischen Periodisierung"" (1921) by Karl Heussi is a German-language book that explores the problem of historical periodization in the context of church history. Heussi discusses the different ways in which historians have divided history into distinct periods, focusing specifically on the division of history into the ancient, medieval, and modern periods...