Oswald Arnold Gottfried Spengler (29 May 1880 – 8 May 1936) was a German historian and philosopher of history whose interests included mathematics, science, and art. He is best known for his book The Decline of the West (Der Untergang des Abendlandes), published in 1918 and 1922, covering all of world history. Spengler's civilization model postulates that any civilization is a superorganism with a limited and predictable lifespan.