Oswald Arnold Gottfried Spengler (1880–1936) 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 model of history postulates that any culture is a superorganism with a limited and predictable lifespan.
Spengler predicted that about the year 2000, Western civilization would enter the period of pre‑death emergency whose countering would necessitate Caesarism (extraconstitutional omnipotence of the executive branch of the central government).
Oswald Spengler was born in 1880 in Blankenburg (the Duchy of Brunswick, the German Reich) as the second child of Bernhard (1844–1901) and Pauline (1840–1910) Spengler. Oswald's elder brother was born prematurely (eight months) in 1879, when his mother tried to move a heavy laundry basket, and died at the age of three weeks. Oswald was born ten months after his brother's death. His younger sisters were Adele (1881–1917), Gertrud (1882–1957), and Hildegard (1885–1942).
Oswald's paternal grandfather, Theodor Spengler (1806–76), was a metallurgical inspector (Hütteninspektor) in Altenbrak. Oswald's father, Bernhard Spengler, held the position of a postal secretary (Postsekretär) and was a hard-working man with a marked dislike of intellectualism, who tried to instill the same values and attitudes in his son.
On 26 May 1799, Friedrich Wilhelm Grantzow, a tailor's apprentice in Berlin, married a Jewish woman named Bräunchen Moses (whose parents, Abraham and Reile Moses, were both deceased by that time). Shortly before the wedding, Bräunchen Moses (ca. 1769–1849) was baptized as Johanna Elisabeth Anspachin (the surname was chosen after her birthplace—Anspach). The couple gave birth to eight children (three before and five after the wedding), one of whom was Gustav Adolf Grantzow (1811–83)—a solo dancer and ballet master in Berlin, who in 1837 married Katharina Kirchner (1813–73), a nervously beautiful solo dancer from a Munich Catholic family; the second of their four daughters was Oswald Spengler's mother Pauline Grantzow. Like the Grantzows in general, Pauline was of a Bohemian disposition, and, before marrying Bernhard Spengler, accompanied her dancer sister on tours. She was the least talented member of the Grantzow family. In appearance, she was plump and bit unseemly. Her temperament, which Oswald inherited, complimented her appearance and frail physique: she was moody, irritable, and morose.