She was the illegitimate daughter of Augustus II the Strong, ruler of Saxony and Poland–Lithuania, and his mistress, the Turk Fatima or Fatime, later renamed Maria Aurora von Spiegel.
Shortly after the birth of Frederick Augustus, the King married Maria Anna to his chamberman Johann Georg (von) Spiegel, but she remained as his mistress.
Augustus II took the guardianship of his children, but only recognized and legitimized both in 1724 and they were granted the title of Count and Countess Rutowska.
The now Countess Rutowska was married off by her father on 1 October 1724[3] to the Polish nobleman Count Michał Bieliński.
In 1737,[4] she re-married, this time, a Sabaudian aristocrat in Saxon service, Count Claude Marie de Bellegarde et d'Entremont (1700–1755).