In 1719 he commissioned the Italian painter Francesco Solimena to execute both the altarpiece for the Palace Chapel and the ceiling fresco in the Golden Room. In the same year Gaetano Fanti was commissioned to execute the illusionistic quadratura painting in the Marble Hall. In 1720 Carlo Carlone was entrusted with the task of painting the ceiling fresco in the Marble Hall, which he executed from 1721 to 1723. The building was completed in 1723. The Sala Terrena, however, was at risk of collapsing due to structural problems, and in the winter of 1732–33 Hildebrandt was forced to install a vaulted ceiling supported by four Atlas pillars, giving the room its current appearance. Salomon Kleiner, an engineer from the Mainz elector's court, produced a ten-part publication between 1731 and 1740 containing a total of ninety plates, entitled Wunder würdiges Kriegs- und Siegs-Lager deß Unvergleichlichen Heldens Unserer Zeiten Eugenii Francisci Hertzogen zu Savoyen und Piemont ("Wondrous war and victory encampment of the supreme hero of our age Eugene Francis Duke of Savoy and Piedmont"), which documented in precise detail the state of the Belvedere complex. The Upper Belvedere appears on the 20-cent Austrian euro coin. After the death of Prince Eugene When Prince Eugene died in his City Palace in Vienna on 21 April 1736, he did not leave a legally binding will. A commission set up by the Holy Roman Emperor Charles VI named the prince's niece Victoria as his heir. She was the daughter of his eldest brother Thomas and the only surviving member of the house of Savoy-Soissons. Princess Victoria moved into the Belvedere, known at that point as the Gartenpalais, on 6 July 1736, but immediately made clear that she was not interested in her inheritance and aimed to auction off the palace complex as soon as possible. On 15 April 1738, she married Prince Joseph of Saxe-Hildburghausen (1702–87), who was several years her junior, in the presence of the royal family in the Schlosshof in the Marchfeld region, Lower Austria. Her choice of husband proved an unfortunate one, however, and the poorly-matched couple divorced in 1744. Yet it was only when Princess Victoria finally decided to leave Vienna and return to her home city of Turin, Italy, eight years later that Maria Theresa, the daughter of Charles VI, was able to purchase the estate. The imperial couple never moved into the Gartenpalais, which was first described