Edited sentence: Another son was the Emperor Leopold II.Francis was quite the philanderer and was known for his many indiscreet affairs, notably one with Princess Auersperg, who was thirty years his junior.Francis was well content to leave the wielding of power to his able wife.He also took a great interest in the natural sciences.He died suddenly in his carriage while returning from the opera at Innsbruck on 18 August 1765.He had a natural fund of good sense and some business capacity and was a useful assistant to Maria Theresa in the laborious task of governing the complicated Austrian dominions, but his functions appear to have been primarily secretarial.He is buried in tomb number 55 in the Imperial Crypt in Vienna.He was a member of the Freemasons.He was officially succeeded by his eldest son Joseph II although the real power remained with his wife.His wife secured in the Treaty of Füssen his election to the Empire on 13 September 1745, in succession to Charles VII, and she made him co-regent of her hereditary dominions.Maria Theresa and Francis I had sixteen children--their youngest daughter was the future queen consort of France, Marie Antoinette (1755-1793).On 12 February 1736 Francis and Maria Theresa were married, and they went for a short time to Florence, when he succeeded to the grand duchy on the death of Gian Gastone de' Medici, the last of the ruling house of Medici.This particular affair has been remarked upon the letters and journals of visitors to the court and his children