Through the analysis of the complete manuscripts of four plays by Herder, written during his stays in Riga and Buckeburg - Ein Skaldengesang, Sokrates, Brutus and Philoktetes. Scenen mit Gesang -, this study investigates the wide scope of Herder's interdisciplinarity by revealing the close links between his reflections on the philosophy of history and his dramaturgic writing. The philological research, as well as the breadth and variety of sources consulted, reveal how the boundaries between disciplines shift and transform in the author's mind as he deals with certain themes common to the philosophy of history and theater, including mythology and destiny, or the notions of origin and nature.