ancient egypt ariosophy catholicism central europe conspiracy theory david irving digital object identifier gavin menzies historical method historiography and nationalism history holocaust denial immanuel velikovsky karl maria wiligut mary magdalene merovingian misery lit nazi occultism nazism nicholas goodrick-clarke northern italy occult phantom time hypothesis priory of sion pseudoarchaeology pseudoscience pseudoscientific metrology rudolf von sebottendorf slovenes sweden the occult roots of nazism the two babylons venetic theory worlds in collision