Adolf Hitler was born on April 20, 1889, in the Austrian town of Braunau am Inn on the German-Austrian border. His father, Alois Hitler, was a provincial customs official of liberal views who had risen from an unpromising background to the respectable status of middle-grade civil servant of the Habsburg Empire. Alois's patrimony was a source of controversy and rumor. He was the illegitimate son of Maria Anna Schicklgruber and an unknown father. In 1842 Maria Anna married Johann Georg Hiedler, and in 1876 Alois adopted the name of his stepfather, later changing the spelling to Hitler. As the Nazis came to prominence and Adolf Hitler emerged a national political figure, there was some speculation that Adolf's unknown grandfather was Jewish, but no credible evidence to support such rumors has ever surfaced.
- From The Third Reich: A History of Nazi Germany by Thomas Childers