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Dr. Gottlieb Wilhelm Leitner was born in Pest, Hungary, on 14 October 1840 to a Jewish family. His mother was Marie Henriette Herzberg. His father, Leopold Saphir, died when Gottlieb was young and his mother then married Johann Moritz Leitner. Gottlieb and his sister Elisabeth (the mother of British politician Leopold Amery) were thereafter known as Leitner.