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Hermann Karl von Keyserling
Portrait by Michael Christoph Hagelgans
Born	1695 (1695) Blīdene manor,Duchy of Courland and Semigallia
Died	30 September 1764(1764-09-30) (aged 68–69) Warsaw,Polish–Lithuanian Commonwealth
Father	Otto Ernst von Keyserling
Mother	Anna Sibilla von Manteuffel-Szoege

CountHermann Karl von Keyserling (Russian:Герман Карл фон Кейзерлинг,romanized: German Karl fon Keyzerling; 1697 – 30 September 1764) was a Russian diplomat from theKeyserlingk family ofBaltic German nobility based in theDuchy of Courland and Semigallia.

In 1733, the nobility of Courland sent Keyserling toSaint Petersburg in order to informErnst Johann von Biron that he had been elected Duke of Courland. Biron was so pleased with the news that he had Keyserlingk appointed President of theSaint Petersburg Academy of Sciences.

A year later, Keyserling was appointed Ambassador of theRussian Empire at the court ofAugust III in Dresden and Warsaw. He kept this position until his death. As the Russian ambassador to the imperial court in Vienna he was made an imperial count in 1744.

Johann Sebastian Bach was said by his first biographer,Johann Nikolaus Forkel, to have composed theGoldberg Variations for Count Keyserling as a sleep aid. The work takes its name fromJohann Gottlieb Goldberg, a musician in the service of Count Keyserling.

His son Heinrich Christian von Keyserling was the wealthiest aristocrat ofKönigsberg,whose palace was frequented by the likes ofImmanuel Kant andJohann Gottfried Herder. His marriage toCaroline von Keyserling was childless.

Hermann Karl's daughter Anna von Medem was the great-grandmother of geologistAlexander Keyserling.

•  "Кейзерлинг, Герман-Карл" .Brockhaus and Efron Encyclopedic Dictionary (in Russian). 1906.

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