In Rosenberg's view of world history, migrating Aryans founded various ancient civilizations which later declined and fell due to inter-marriage with lesser races. These civilizations included the Indo-Aryan civilization, ancient Persia, Greece, and Rome. He saw the ancient Germanic invasions of the Roman empire as "saving" its civilization, which had been corrupted both by race mixing and by "Judaized-cosmopolitan" Christianity. Furthermore, he claimed that the persecutions of Protestants in France and other areas represented the wiping out of the last remnants of the Aryan element in those areas, a process completed by the French revolution. In contemporary Europe, he saw the northern areas that embraced Protestantism as closest to the Aryan racial and spiritual ideal.