Alexander Keyserling
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Alexander Friedrich Michael Lebrecht Nikolaus Arthur, Graf von Keyserling (August 15, 1815 – May 8, 1891) was a German geologist and paleontologist. A member of the Keyserling clan, a wealthy aristocratic Baltic German family, he is considered to be one of the founders of Russian geology, making many expeditions on behalf of his close personal friend and friend of the family, Tsar Nicholas I.
He was also a botanist.