Tags: Monarch.

Ernst Johann von Biron (German: Ernst Johann von Biron; Russian: Эрнст Иоганн Бирон; November 23 [O.S. 13 November] 1690 – December 29 [O.S. 18 December] 1772) was a Duke of Courland and Semigallia (1737) and regent of the Russian Empire (1740).

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