Ernst Johann von Biron
Duke of Courland and Semigallia
Years: 1690 - 1772
Ernst Johann von Biron (Latvian: Ernests Johans Bīrons; November 23 [O.S.
13 November] 1690 – December 29 [O.S.
18 December] 1772) is a Duke of Courland and Semigallia (1737) and regent of the Russian Empire (1740).
