Before revision: Scientific Surveys in Central America and the Pacific Alexander von Humboldt (1799–1804) 400px|Alexander von Humboldt's Latin American expedition Between 1799 and 1804, Alexander von Humboldt a German naturalist and explorer, traveled extensively in Spanish America, under the protection of king Charles IV of Spain.
After revision: BaronScientific Surveys in Central America and the Pacific Alexander von Humboldt (1799–1804) 400px|Alexander von Humboldt's Latin American expedition Between 1799 and 1804, Alexander von Humboldt a German naturalist and explorer, traveled extensively in Spanish America, under the protection of king Charles IV of Spain.