In 1723, Biron married
Benigna Gottlieb von Trotha genannt Treyden (1703–1782),
lady-in-waiting to Regent Anna and the daughter of a
Baltic-German nobleman. The marriage, which was reportedly arranged by Anna in an attempt to conceal her own relationship with Biron, proved harmonious and felicitous. His wife remained devoted to Biron not only throughout his years as Anna's favorite and confidant, but also during his two decades of exile to Siberia after her death, which Benigna shared with Biron. They had three children together, a son,
Peter, prince of Courland, a son Karl Ernst von Biron (1728–1801) and a daughter,
Hedvig Elizabeth. In 1730,
Anna was elevated to the Russian throne. Biron and his wife moved to Moscow, both of them retaining their position as adviser and lady-in-waiting, and received many honours and riches. At Anna's coronation (19 May 1730), Biron was appointed grand chamberlain, made
a count of the Empire, and granted an estate at
Wenden with an income of 50,000 crowns a year. It was on this occasion that his name was first rendered in court documents as 'Biron' (rather than 'Biren'), and he is said to have adopted the arms of the French Ducal House of Biron, to which house he did not in fact have the slightest connection. The Council of the Empire attempted to secure from Anna
an aristocratic constitution, but she crushed the powerful nobility, notably the
Dolgorukis and the
Galitsins, and placed her reliance exclusively on Biron, who became for all practical purposes the ruler of the Empire. His ascendancy over the empress was unshakable, and whenever required, Biron's enemies and rivals were swept out of the way quite literally; he is said to have caused over 1,000 executions, while the number of persons exiled by him to Siberia is estimated at between 20,000–40,000. Meanwhile, the common people were ground down by taxation. Russians have described this reign as the
Bironovshchina. Nevertheless, he showed himself an administrator of considerable ability, and maintained order in the Empire at a time when troubles could have been expected, because the main Romanov line was now extinct, and even the empress did not have children or definite heirs. During the latter years of Anna's reign in Russia, Biron increased enormously in power and riches. His apartments in the palace adjoined those of the empress, and his liveries, furniture and equipages were scarcely less expensive or splendid than hers. The magnificence of his plate astonished the French ambassador, and the diamonds of his duchess were the envy of princes. A special department of state looked after his brood mares and stallions. He had landed estates everywhere. Half the bribes intended for the Russian court passed through his coffers. ==Duke of Courland and Semigallia==