Peter von Biron, last Duke of Courland and Semigallia died at Jeleniów Palace on January 13, 1800.
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Though Edmond was indifferent about the match, she was from German-Baltic nobility, as the illegitimate daughter of Alexander Batowski and Dorothea von Medem (though her mother's husband Peter von Biron, last duke of Courland, acknowledged her as his own).
In 1763 Catherine II of Russia re-established him in his duchy, which he bequeathed to his son Peter.
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.
Princess Yevdokiya Borisovna Yusupova May 5 (NS: May 16) 1743, Moscow - July 19 (NS: July 8) 1780, Saint Petersburg), married on March 6, 1774, Mitava (Mittau) (divorced in 1777 or 1778), as his second wife, to Peter von Biron, the last Duke von Kurland (1769–1795) and the first Duke von Sagan (1786–1795) (February 15, 1724, Mitava (Mittau) - January 13, 1800, Schloss Gellenau), without offspring