The trial of his followers commenced forthwith, and the whole of them were sentenced to various terms of imprisonment. Borri's trial proceeded in his absence, and lasted for upwards of two years. He was condemned to death as a heretic and sorcerer in 1661, and was burned in effigy in Rome by the common hangman.
Borri, in the mean time, lived quietly in Switzerland, indulging himself in railing at the Inquisition and its proceedings. He afterwards went to Strasbourg, intending to fix his residence in that town. He was received with great cordiality, as a man persecuted for his religious opinions, and withal a great alchymist. He found that sphere too narrow for his aspiring genius, and retired in the same year to the more wealthy city of Amsterdam. He there hired a magnificent house, established an equipage which eclipsed in brilliancy those of the richest merchants, and assumed the title of Excellency. Where he got the money to live in this expensive style was long a secret: the adepts in alchymy easily explained it, after their fashion. Sensible people were of opinion that he had come by it in a less wonderful manner; for it was remembered that among his unfortunate disciples in Milan, there were many rich men, who, in conformity with one of the fundamental rules of the sect, had given up all their earthly wealth into the hands of their founder. In whatever manner the money was obtained, Borri spent it in Holland with an unsparing hand, and was looked up to by the people with no little respect and veneration. He performed several able cures, and increased his reputation so much that he was vaunted as a prodigy. He continued diligently the operations of alchymy, and was in daily expectation that he should succeed in turning the inferior metals into gold. This hope never abandoned him, even in the worst extremity of his fortunes; and in his prosperity it led him into the most foolish expenses: but he could not long continue to live so magnificently upon the funds he had brought from Italy; and the philosopher's stone, though it promised all for the wants of the morrow, never brought any thing for the necessities of to-day. He was obliged in a few months to retrench, by giving up his large house, his gilded coach and valuable blood-horses, his liveried domestics, and his luxurious entertainments. With this diminution of splendour came a diminution of renown. His cures did not appear so miraculous, when he went out on foot to perform them, as they had seemed when "his Excellency" had driven to a poor man's door in his carriage with six horses. He sank from a prodigy into an ordinary man. His great friends shewed him the cold shoulder, and his humble flatterers carried their incense to some other shrine. Borri now thought it high time to change his quarters. With this view he borrowed money wherever he could get it, and succeeded in obtaining two hundred thousand florins from a merchant named De Meer, to aid, as he said, in discovering the water of life. He also obtained six diamonds of great value, on pretence that he could remove the flaws from them without diminishing their weight. With this booty he stole away secretly by night, and proceeded to Hamburgh.