Friedrich Wilhelm Heinrich Alexander von Humboldt ( listen ( help · info ) ; September 14 , 1769 - May 6 , 1859 ) was a German ( Prussian ) geographer , naturalist and explorer , and the younger brother of the Prussian minister , philosopher and linguist Wilhelm von Humboldt ( 1767-1835 ) .
Alexander von Humboldt ( Berlin , 14 September 1769 - Berlin , 6 May 1859 ) was a Prussian naturalist and explorer .