Andrey Kurbsky
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In this name that follows Eastern Slavic naming customs, the patronymic is Mikhailovich and the family name is Kurbsky.
Prince Andrey Mikhailovich Kurbsky (Russian: Андрей Михайлович Курбский; Polish: Andriej Michajłowicz Kurbski; 1528–1583) was a Russian political figure, military leader, and political philosopher, known as an intimate friend and then a leading political opponent of the Russian tsar Ivan the Terrible (r. 1533–1584). His correspondence with the tsar provides a unique source for the history of 16th-century Russia.