Caffarelli was regarded as Farinelli's rival; and some critics, including Porpora, who had taught both, considered him the greatest singer of the two. This sopranist was notorious for his intolerable insolence, of which numerous anecdotes are told. He would affect indisposition, when persons of great importance were anxious to hear him sing, and had engaged him for that purpose. "Omnibus hoc vitium cantoribus;" but it may be said Caffarelli was capricious and overbearing to an unusual extent. Metastasio, in one of his letters, tells us that at a rehearsal which had been ordered at the Opera of Vienna, all the performers obeyed the summons except Caffarelli; he appeared, however, at the end of the rehearsal, and asked the company with a very disdainful air, "What was the use of these rehearsals?" The conductor answered, in a voice of authority, "that no one was called upon to account to him for what was done; that he ought to be glad that his failure in attendance had been suffered; that his presence or absence was of little consequence to the success of the opera; but that whatever he chose to do himself, he ought, at least, to let others do their duty." Caffarelli, in a great rage, exclaimed "that he who had ordered such a rehearsal was a solemn coxcomb." At this, all the patience and dignity of the poet forsook him; "and getting into a towering passion, he honoured the singer with all those glorious titles which Caffarelli had earned in various parts of Europe, and slightly touched, but in lively colours, some of the most memorable particulars of his life; nor was he likely soon to come to a close; but the hero of the panegyric, cutting the thread of his own praise, boldly called out to his eulogist: 'Follow me, if thou hast courage, to a place where there is none to assist thee, * * * * * The bystanders tremble; each calls on his tutelar saint, expecting every moment to see poetical and vocal blood besprinkle the harpsichords and double basses. But at length the Signora Tesi, rising from under her canopy, where, till now, she had remained a most tranquil spectator, walked with a slow and stately step towards the combatants; when, O sovereign power of beauty! the frantic Caffarelli, even in the fiercest paroxysm of his wrath, captivated and appeased by this unexpected tenderness, runs with rapture to meet her; lays his sword at her feet; begs pardon for his error; and generously sacrificing to her his vengeance, seals, with a thousand kisses upon her hand, his protestations of obedience, respect and humility. The nymph signifies her forgiveness by a nod; the poet sheathes his sword; the spectators begin to breathe again; and the tumultuous assembly breaks up amid the joyous sounds of laughter."