Ernst Johann von Biron 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.
- Occupation
- politician
- Position held
- regent
- Citizenship
- Duchy of Courland and Semigallia, Russian Empire
- Born
- November 13, 1690
- Died
- December 17, 1772, December 18, 1772