Vasari at this epoch becomes one of our most reliable authorities regarding the life of Michelangelo. He corresponded and conversed with him continuously, and enjoyed the master's confidence. We may therefore accept the following narrative as accurate: "It was some little while before the beginning of 1551, when Vasari, on his return from Florence to Rome, found that the sect of Sangallo were plotting against Michelangelo; they induced the Pope to hold a meeting in S. Peter's, where all the overseers and workmen connected with the building should attend, and his Holiness should be persuaded by false insinuations that Michelangelo had spoiled the fabric. He had already walled in the apse of the King where the three chapels are, and carried out the three upper windows. But it was not known what he meant to do with the vault. They then, misled by their shallow judgment, made Cardinal Salviati the elder, and Marcello Cervini, who was afterwards Pope, believe that S. Peter's would be badly lighted. When all were assembled, the Pope told Michelangelo that the deputies were of opinion the apse would have but little light. He answered: 'I should like to hear these deputies speak.' The Cardinal Marcello rejoined: 'Here we are.' Michelangelo then remarked: 'My lord, above these three windows there will be other three in the vault, which is to be built of travertine.' 'You never told us anything about this,' said the Cardinal. Michelangelo responded: 'I am not, nor do I mean to be obliged to tell your lordship or anybody what I ought or wish to do. It is your business to provide money, and to see that it is not stolen. As regards the plans of the building, you have to leave those to me.' Then he turned to the Pope and said: 'Holy Father, behold what gains are mine! Unless the hardships I endure prove beneficial to my soul, I am losing time and labour.' The Pope, who loved him, laid his hands upon his shoulders and exclaimed: 'You are gaining both for soul and body, have no fear!' Michelangelo's spirited self-defence increased the Pope's love, and he ordered him to repair next day with Vasari to the Vigna Giulia, where they held long discourses upon art." It is here that Vasari relates how Julius III. was in the habit of seating Michelangelo by his side while they talked together.
Julius then maintained the cause of Michelangelo against the deputies. It was during his pontificate that a piece of engineering work committed to Buonarroti's charge by Paul III. fell into the hands of Nanni di Baccio Bigio. The old bridge of Santa Maria had long shown signs of giving way, and materials had been collected for rebuilding it. Nanni's friends managed to transfer the execution of this work to him from Michelangelo. The man laid bad foundations, and Buonarroti riding over the new bridge one day with Vasari, cried out: "George, the bridge is quivering beneath us; let us spur on, before it gives way with us upon it." Eventually, the bridge did fall to pieces, at the time of a great inundation. Its ruins have long been known as the Ponte Rotto.
On the death of Julius III. in 1555, Cardinal Cervini was made Pope, with the title of Marcellus II. This event revived the hopes of the sect, who once more began to machinate against Michelangelo. The Duke of Tuscany at this time was exceedingly anxious that he should take up his final abode at Florence; and Buonarroti, feeling he had now no strong support in Rome, seems to have entertained these proposals with alacrity. The death of Marcellus after a few weeks, and the election of Paul IV., who besought the great architect not to desert S. Peter's, made him change his mind. Several letters written to Vasari and the Grand Duke in this and the next two years show that his heart was set on finishing S. Peter's, however much he wished to please his friends and longed to end his days in peace at home. "I was set to work upon S. Peter's against my will, and I have served now eight years gratis, and with the utmost injury and discomfort to myself. Now that the fabric has been pushed forward and there is money to spend, and I am just upon the point of vaulting in the cupola, my departure from Rome would be the ruin of the edifice, and for me a great disgrace throughout all Christendom, and to my soul a grievous sin. Pray ask his lordship to give me leave of absence till S. Peter's has reached a point at which it cannot be altered in its main features. Should I leave Rome earlier, I should be the cause of a great ruin, a great disgrace, and a great sin." To the Duke he writes in 1557 that his special reasons for not wishing to abandon S. Peter's were, first, that the work would fall into the hands of thieves and rogues; secondly, that it might probably be suspended altogether; thirdly, that he owned property in Rome to the amount of several thousand crowns, which, if he left without permission, would be lost; fourthly, that he was suffering from several ailments. He also observed that the work had just reached its most critical stage (i.e., the erection of the cupola), and that to desert it at the present moment would be a great disgrace.
The vaulting of the cupola had now indeed become the main preoccupation of Michelangelo's life. Early in 1557 a serious illness threatened his health, and several friends, including the Cardinal of Carpi, Donato Giannotti, Tommaso Cavalieri, Francesco Bandini, and Lottino, persuaded him that he ought to construct a large model, so that the execution of this most important feature of the edifice might not be impeded in the event of his death. It appears certain that up to this date no models of his on anything like a large intelligible scale had been provided for S. Peter's; and the only extant model attributable to Michelangelo's own period is that of the cupola. This may help to account for the fact that, while the cupola was finished much as he intended, the rest of his scheme suffered a thorough and injurious remodelling.
He wrote to his nephew Lionardo on the 13th of February 1557 about the impossibility of meeting the Grand Duke's wishes and leaving Rome. "I told his Lordship that I was obliged to attend to S. Peter's until I could leave the work there at such a point that my plans would not be subsequently altered. This point has not been reached; and in addition, I am now obliged to construct a large wooden model for the cupola and lantern, in order that I may secure its being finished as it was meant to be. The whole of Rome, and especially the Cardinal of Carpi, puts great pressure on me to do this. Accordingly, I reckon that I shall have to remain here not less than a year; and so much time I beg the Duke to allow me for the love of Christ and S. Peter, so that I may not come home to Florence with a pricking conscience, but a mind easy about Rome." The model took about a year to make. It was executed by a French master named Jean.
All this while Michelangelo's enemies, headed by Nanni di Baccio Bigio, continued to calumniate and backbite. In the end they poisoned the mind of his old friend the Cardinal of Carpi. We gather this from a haughty letter written on the 13th of February 1560: "Messer Francesco Bandini informed me yesterday that your most illustrious and reverend lordship told him that the building of S. Peter's could not possibly go on worse than it is doing. This has grieved me deeply, partly because you have not been informed of the truth, and also because I, as my duty is, desire more than all men living that it should proceed well. Unless I am much deceived, I think I can assure you that it could not possibly go on better than it now is doing. It may, however, happen that my own interests and old age expose me to self-deception, and consequently expose the fabric of S. Peter's to harm or injury against my will. I therefore intend to ask permission on the first occasion from his Holiness to resign my office. Or rather, to save time, I wish to request your most illustrious and reverend lordship by these present to relieve me of the annoyance to which I have been subject seventeen years, at the orders of the Popes, working without remuneration. It is easy enough to see what has been accomplished by my industry during this period. I conclude by repeating my request that you will accept my resignation. You could not confer on me a more distinguished favour."
Giovanni Angelo Medici, of an obscure Milanese family, had succeeded to Paul IV. in 1559. Pius IV. felt a true admiration for Michelangelo. He confirmed the aged artist in his office by a brief which granted him the fullest authority in life, and strictly forbade any departure from his designs for S. Peter's after death. Notwithstanding this powerful support, Nanni di Baccio Bigio kept trying to eject him from his post. He wrote to the Grand Duke in 1562, arguing that Buonarroti was in his dotage, and begging Cosimo to use his influence to obtain the place for himself. In reply the Grand Duke told Nanni that he could not think of doing such a thing during Michelangelo's lifetime, but that after his death he would render what aid was in his power. An incident happened in 1563 which enabled Nanni to give his enemy some real annoyance. Michelangelo was now so old that he felt obliged to leave the personal superintendence of the operations at S. Peter's to a clerk of the works. The man employed at this time was a certain Cesare da Castel Durante, who was murdered in August under the following circumstances, communicated by Tiberio Calcagni to Lionardo Buonarroti on the 14th of that month: "I have only further to speak about the death of Cesare, clerk of the works, who was found by the cook of the Bishop of Forli with his wife. The man gave Cesare thirteen stabs with his poignard, and four to his wife. The old man (i.e., Michelangelo) is in much distress, seeing that he wished to give the post to that Pier Luigi, and has been unable to do so owing to the refusal of the deputies." This Pier Luigi, surnamed Gaeta, had been working since November 1561 as subordinate to Cesare; and we have a letter from Michelangelo to the deputies recommending him very warmly in that capacity. He was also the house-servant and personal attendant of the old master, running errands for him and transacting ordinary business, like Pietro Urbano and Stefano in former years. The deputies would not consent to nominate Pier Luigi as clerk of the works. They judged him to be too young, and were, moreover, persuaded that Michelangelo's men injured the work at S. Peter's. Accordingly they appointed Nanni di Baccio Bigio, and sent in a report, inspired by him, which severely blamed Buonarroti. Pius IV., after the receipt of this report, had an interview with Michelangelo, which ended in his sending his own relative, Gabrio Serbelloni, to inspect the works at S. Peter's. It was decided that Nanni had been calumniating the great old man. Accordingly he was dismissed with indignity. Immediately after the death of Michelangelo, however, Nanni renewed his applications to the Grand Duke. He claimed nothing less than the post of architect-in-chief. His petition was sent to Florence under cover of a despatch from the Duke's envoy, Averardo Serristori. The ambassador related the events of Michelangelo's death, and supported Nanni as "a worthy man, your vassal and true servant."
IX
Down to the last days of his life, Michelangelo was thus worried with the jealousies excited by his superintendence of the building at S. Peter's; and when he passed to the majority, he had not secured his heart's desire, to wit, that the fabric should be forced to retain the form he had designed for it. This was his own fault. Popes might issue briefs to the effect that his plans should be followed; but when it was discovered that, during his lifetime, he kept the builders in ignorance of his intentions, and that he left no working models fit for use, except in the case of the cupola, a free course was opened for every kind of innovation. So it came to pass that subsequent architects changed the essential features of his design by adding what might be called a nave, or, in other words, by substituting the Latin for the Greek cross in the ground-plan. He intended to front the mass of the edifice with a majestic colonnade, giving externally to one limb of the Greek cross a rectangular salience corresponding to its three semicircular apses. From this decastyle colonnade projected a tetrastyle portico, which introduced the people ascending from a flight of steps to a gigantic portal. The portal opened on the church, and all the glory of the dome was visible when they approached the sanctuary. Externally, according to his conception, the cupola dominated and crowned the edifice when viewed from a moderate or a greater distance. The cupola was the integral and vital feature of the structure. By producing one limb of the cross into a nave, destroying the colonnade and portico, and erecting a huge façade of barocco design, his followers threw the interior effect of the cupola into a subordinate position, and externally crushed it out of view, except at a great distance. In like manner they dealt with every particular of his plan. As an old writer has remarked: "The cross which Michelangelo made Greek is now Latin; and if it be thus with the essential form, judge ye of the details!" It was not exactly their fault, but rather that of the master, who chose to work by drawings and small clay models, from which no accurate conception of his thought could be derived by lesser craftsmen.
We cannot, therefore, regard S. Peter's in its present state as the creation of Buonarroti's genius. As a building, it is open to criticism at every point. In spite of its richness and overwhelming size, no architect of merit gives it approbation. It is vast without being really great, magnificent without touching the heart, proudly but not harmoniously ordered. The one redeeming feature in the structure is the cupola; and that is the one thing which Michelangelo bequeathed to the intelligence of his successors. The curve which it describes finds no phrase of language to express its grace. It is neither ellipse nor parabola nor section of the circle, but an inspiration of creative fancy. It outsoars in vital force, in elegance of form, the dome of the Pantheon and the dome of Brunelleschi, upon which it was actually modelled. As a French architect, adverse to Michelangelo, has remarked: "This portion is simple, noble, grand. It is an unparalleled idea, and the author of this marvellous cupola had the right to be proud of the thought which controlled his pencil when he traced it." An English critic, no less adverse to the Italian style, is forced to admit that architecture "has seldom produced a more magnificent object" than the cupola, "if its bad connection with the building is overlooked." He also adds that, internally, "the sublime concave" of this immense dome is the one redeeming feature of S. Peter's.