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San Ildefonso, Treaty of

(Encyclopedia) San Ildefonso, Treaty of, any of several treaties signed at the royal residence of San Ildefonso, Spain. 1 The Treaty of San Ildefonso of 1796 was an alliance of France with Spain…

Carlos, second son of Charles IV of Spain

(Encyclopedia) Carlos (Carlos María Isidro de Borbón), 1788–1855, second son of Charles IV of Spain. He was the first Carlist pretender. After his father's abdication (1808) he was, with the rest of…

Humboldt, Alexander, Freiherr von

(Encyclopedia) Humboldt, Alexander, Freiherr vonHumboldt, Alexander, Freiherr vonhŭmˈbōlt, Ger. älĕksänˈdər frīˈhĕr fən h&oobreve;mˈbôlt [key], 1769–1859, German naturalist, inventor, explorer,…