His extremity prompted him to renew his relations with the masonic societies within the area of the Papal States. A penalty of death hung over the initiates of the superior grades, and their lodges were in consequence surrounded with great mystery, and were convened in subterranean places. He was persuaded to found a lodge of Egyptian Freemasonry in Rome itself, from which moment Lorenza reasonably regarded him as lost. One of his own adepts betrayed him; he was arrested on the 27th of September 1789, by order of the Holy Office, and imprisoned in the Castle of St Angelo. An inventory of his papers was taken, and all his effects were sealed up. The process against him was drawn up with the nicest inquisitorial care during the long period of eighteen months. When the trial came on he was defended by the Count Gætano Bernardini, advocate of the accused before the sacred and august tribunal, and to this pleader in ordinary the impartial and benign office, of its free grace and pleasure, did add generously, as counsel, one Monsignor Louis Constantini, “whose knowledge and probity,” saith an unbought and unbuyable witness (inquisitorially inspired), “were generally recognised.” They did not conceal from him the gravity of his position, advised him to refrain from basing his defence on a series of denials, promising to save him from the capital forfeit, and so he was persuaded to confess everything, was again reconciled to the church; and being almost odoriferous with genuine sanctity, on the 21st of March 1791 he was carried before the general assembly of the purgers of souls by fire, before the Pope on the 7th of the following April, when the advocates pleaded with so much eloquence that they retired in the agonies of incipient strangulation, Cagliostro repeated his avowal, and as a natural consequence of the unbought eloquence and the purchased confession, the penalty of death was pronounced. When, however, the shattered energies of the advocates were a little recruited, a recommendation of mercy was addressed to the Pope, the sentence was commuted to perpetual imprisonment, and the condemned man was consigned to the Castle of St Angelo. After an imprisonment of two years, he died, God knows how, still in the prime of life, at the age of fifty.