Ernst Johann von Biron
Duke of Courland (r. 1737–1740; 1763–1769)
Ernst Johann von Biron
Ernst Johann von Biron (German: Ernst Johann von Biron; Russian: Эрнст Иоганн Бирон; 23 November [O.S. 13 November] 1690 – 29 December [O.S. 18 December] 1772) was the duke of Courland and Semigallia from 1737 to 1740 and again from 1763 to 1769. He was also briefly the regent of the Russian Empire in 1740.
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