Description: (Duke)
Ernst Johann von Biron was a Duke of Courland and Semigallia who also acted as a regent of the Russian Empire. He held the title of Duke of Courland twice, from 1737 to 1740 and again from 1763 to 1769. Biron briefly served as regent of the Russian Empire in 1740. Known for his political influence and power, he played a significant role in the governance of Courland and had a notable but short-lived impact on the administration of the Russian Empire during his regency.