According to Wikipedia: "Felix Ludwig Julius Dahn (February 9, 1834 – January 3, 1912) was a German lawyer, author and historian… Dahn's writings were extremely influential in forming the conception of the European history unfolding during the first millennium CE which dominated German-speaking countries during the late 19th and early 20th century. His multi-volume Prehistory of the Germanic and Roman Peoples, a chronology of the European Völkerwanderung (Migration Period) that first appeared in print in 1883, was so definitive that abbreviated versions were reprinted until the late 1970s. His works contributed to the foundation of National Socialism in Germany[3] while his book Ein Kampf um Rom encouraged a "voelkisch avant-garde" who feared the supposed danger of ethnic mixing."