That science-fiction extravaganza Dune allegorizes contemporary themes of imperialism, economic addiction to oil, and religious war is obvious. But it turns out that Frank Herbert's masterpiece owes much to one book in particular: Lesley Blanch's brilliant, half-forgotten Sabres of Paradise, about the warlords of the Caucasus, where Europe and Asia meet.

Anyone who has obsessed over the mythology of Dune will immediately recognize the language Herbert borrowed from Blanch's work. Chakobsa, a Caucasian hunting language, becomes the language of a galactic diaspora in Herbert's universe. Kanly, from a word for blood feud among the Islamic tribes of the Caucasus, signifies a vendetta between Dune's great spacefaring dynasties. Kindjal, the personal weapon of the region's Islamic warriors, becomes a knife favored by Herbert's techno-aristocrats. As Blanch writes, "No Caucasian man was properly dressed without his kindjal."

Herbert is ecumenical with his borrowing, lifting terminology and rituals from both sides of this obscure Central Asian conflict. When Paul Atreides, Dune's youthful protagonist, is adopted by a desert tribe whose rituals and feuds bear a marked resemblance to the warrior culture of the Islamic Caucasus, he lives at the exotically named Sietch Tabr. Sietch and tabr are both words for camp borrowed from the Cossacks, the Czarist warrior caste who would become the great Christian antagonists of Shamyl's Islamic holy warriors.

Herbert also lifted two of Dune's most memorable lines directly from Blanch. While describing the Caucasians' fondness for swordplay, Blanch writes, "To kill with the point lacked artistry." In Dune, this becomes "[k]illing with the tip lacks artistry," advice given to a young Paul Atreides by a loquacious weapons instructor. A Caucasian proverb recorded by Blanch transforms into a common desert aphorism. "Polish comes from the city, wisdom from the hills," an apt saying for a mountain people, becomes "Polish comes from the cities, wisdom from the desert" in Dune.