Hitler was deeply influenced by his history teacher. He mentioned this at different times.

Leopold Poetsch (18 November 1853 – 16 October 1942) was an Austrian history teacher. He was a high school teacher of Adolf Hitler and Adolf Eichmann influenced the future leader's later views, specifically German nationalism.

He also took some distance from his former pupil, among other things since considering Hitler had become an enemy of Austria.

Hitler credits the determining factor of the entire rest of his future life to Leopold in his book Mein Kampf.