context: Ernst Johann Biron (German: Ernst Johann von Biron; November 23, 1690, Kalnceem Manor (Duchy of Courland and Semigalia, now Kalnciems, Latvia) - December 28, 1772, Mitau Palace, Duchy of Courland) - favorite of the Russian Empress Anna Ioannov Regent of the Russian Empire in October - November 1740, Count of the Holy Roman Empire (from 1730), Duke of Courland and Semigalia from 1737. In 1740-1761 he was in exile.
question: Who is Biron?
answers.text: favorite of the Russian Empress Anna Ioannov Regent of the Russian Empire in October - November 1740, Count of the Holy Roman Empire (from 1730), Duke of Courland and Semigalia from 1737