Final answer:
Ernst Johann von Bühren, known as Biron, was the German consort of Duchess Anna of Courland, later Empress Anna of Russia, and was eventually exiled due to his political exploits.
Step-by-step explanation:
Ernst Johann von Bühren (Biron) was not the husband of Catherine the Great, nor was he the King of Sweden. Bühren was a German nobleman and the consort of Duchess Anna of Courland, who later became Empress Anna of Russia. When Anna passed away in 1740, Bühren was arrested and exiled for his manipulative political maneuvers and influence at court.
During his time in Russia, Ernst Johann von Bühren amassed great power and wealth. However, his exile significantly reduced his influence and marked a notable period in Russian aristocratic politics.