At Anna's coronation (May 19, 1730), he became grand chamberlain, a count of the Empire, on which occasion he is said to have adopted the arms of the French ducal house of Biron, and was presented with an
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In 1763 Catherine II of Russia re-established him in his duchy, which he bequeathed to his son Peter.
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Prince Ernst-Johann Karl Oskar Eitel-Friedrich Peter Burchard Biron of Courland (born August 6, 1940) is the senior male-line descendant of Ernst Johann von Biron and as such heir to the Duchy of Courland and Semigallia.
Hedvig Elizabeth von Biron of Courland (1727–1797), was a princess of Courland and a Russian courtier, daughter of the Duke of Courland, Ernst Johann von Biron, and Benigna Gottlieb von Trotha gt Treyden, and the sister of Peter von Biron.