A painter. After studying in France, he moved to Rome in 1753, where became was influenced by Batoni and Mengs. In 1765 he was summoned to Parma by Philip of Bourbon as a portrait painter. Back in Rome, he made his name as a history and portrait painter with an international clientele (paintings for the Borghese and Barberini palaces, 1774-75). Called to Turin by Victor Amadeus III in 1777, he became the director of the Royal Academy and the first court painter (ceiling of the Royal Library). He received official commissions under the French and during the Restoration.