In 1824 Neumann took part in the negotiations between Portugal and Brazil, as a result of King John VI of Portugal and his son Emperor Pedro I of Brazil were reconciled.
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In December 1826 Neumann was sent to Brazil to negotiate the marriage of Pedro's daughter Maria to his brother Miguel, and the demand by Miguel that he be recognised as regent of Portugal.
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In recognition of his services he was created a Baron by the Emperor Francis I of Austria on 31 August 1830.
Johann Wolfgang von Goethe | Otto von Bismarck | Alexander von Humboldt | Wernher von Braun | Carl Maria von Weber | Herbert von Karajan | Gebhard Leberecht von Blücher | John von Neumann | Lars von Trier | Ferdinand von Mueller | Paul von Hindenburg | Alexander von Humboldt Foundation | Heinrich von Kleist | Anne Sofie von Otter | Erich von Stroheim | Max von Sydow | Justus von Liebig | Georg Philipp Telemann | Hermann von Helmholtz | Franz von Papen | Die Meistersinger von Nürnberg | Carl von Clausewitz | Von Ryan's Express | Richard von Weizsäcker | Theodore von Kármán | Philipp Melanchthon | Manfred von Richthofen | Erich von Däniken | Dita Von Teese | Albrecht von Haller |