After he returned to Rome his health was not sufficient to allow of his usual close application to work, and he went to Berlin and Vienna in company with Prince Rezzonico, and this so benefited him that he was able to resume his labors with new energy. He soon achieved a proud triumph, for his Perseus was placed in one of the Stanze of the Vatican by a public decree; this was the first modern work which had been thus honored.
In 1802-1803 Napoleon requested Canova to go to Paris to model a portrait bust for a colossal statue; the work was finished six years later. In 1805 the artist went again to Vienna, where he modelled a bust of the Emperor of Austria; in 1810 again to Paris to prepare a model for the statue of Maria Louisa. With the exception of these short journeys he was constantly at work in his Roman studio until 1815, when he was sent in an official capacity to France by the pope, for the purpose of reclaiming the works of art which had been carried from Italy in times of war, and which really belonged to the patrimony of the Church. Canova executed his commission with rare judgment, and then continued his journey to England. In London he received many honors; the king gave him an order for a group, held several conversations with him, made him valuable gifts, and intrusted him with a private letter to the pope.
Canova returned to Rome on January 5th, 1816. His entry might almost be called a triumphal one, for the people of Rome were so grateful for the restoration of their treasures that they expressed their joy in demonstrations to Canova. He had been President of St. Luke's Academy before; he was now made President of the Commission to purchase works of art, and of the Academy of Archæology. In full consistory of all the high officers of the Church, the pope caused his name to be inscribed upon the "golden volume of the Capitol," and conferred upon him the title of Marquis of Ischia, with a pension of three thousand crowns a year.
Canova now determined to execute a colossal statue of Religion, which should commemorate the return of the pope from banishment. He endeavored to persuade the authorities to decide where it should be placed; this was not done, and he was much grieved at his failure to carry out the idea. But he determined that from this time he would devote his life and fortune to religion, and resolved to erect a church at Possagno, to adorn it with works of art, and to make it his own burial-place.