From a leading expert comes an intellectual history and analysis of Traditionalism, one of the least known and most influential philosophies that continues to impact politics today.Traditionalism is a shadowy philosophy that has influenced much of the twentieth century and beyond: from the far-right to the environmental movement, from Sufi shaykhs and their followers to Trump advisor and right-wing provocateur Steve Bannon. It is a worldview that rejects modernity and instead turns to mystical truth and tradition as its guide.Mark Sedgwick, one of the world's leading scholars of Traditionalism, presents a major new analysis, pulling back the curtain on the foundations of Traditionalist philosophy, its major proponents -René Guénon, Julius Evola, and Frithjof Schuon- and their thought. One of Traditionalism's fundamental pillars is perennialism, the idea that beneath all the different forms of religion there lies one single timeless and esoteric tradition. A second is the view that everything is getting worse, rather than better, over time, leading to the Traditionalist critique of modernity. Sedgwick details Traditionalism's unique ideas about self-realization, religion, politics, and many other spheres."Traditionalism" provides an expansive guide to this important school of thought -one that is little-known and even less understood- and shows how pervasive these ideas have become.