• Was an Italian-born fresco painter.
• His artistic education concluded with lessons from Francesco Trevisani.
• He obtained the patronage of Cardinal Alessandro Albani and may have also been supported by Cardinal Neri Maria Corsini.
• In 1752, he was invited to Naples by the architect, Ferdinando Fuga.
• Queen Maria Amalia introduced him to her father, Elector Frederick Augustus II, who arranged for him to work in Dresden.
• His Academic inclinations were enhanced in Germany; where he met Pietro Metastasio.
• In 1755, he created frescoes, inspired by Metastasio, at what is now the Austrian Academy of Sciences, and in Schönbrunn Palace.
• As early as 1767, he had submitted drawings to the Russian court in Saint Petersburg.
• In 1770, he was finally called there by Catherine the Great, assisted by the De Derichs.
• But, except for some portraits, his work there never progressed beyond the initial sketches.
• In fact, it was said (by the sculptor, Étienne Maurice Falconet), that he died of a "putrid fever" after Catherine severely criticized a portrait of her.
• For some commentators, the fact that he and De Derichs died on the same day, followed by De Derichs' wife the day after, suggests that they were poisoned.
• Falconet's comment may indicate that he was not well-liked.