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Gustav Stresemann was the German Foreign Minister who shared the 1926 Nobel Peace Prize with Aristide Briand. Stresemann was a leading figure in the Weimar Republic, and he was instrumental in negotiating the Treaty of Locarno, which was seen as a major step towards peace in Europe. The Nobel Peace Prize was awarded to Stresemann and Briand for their work in promoting peace and reconciliation between Germany and France.