Renaissance_ A Short History, The - Johnson, Paul [43]
Michelangelo was obsessed by the dome, and produced a number of designs leaning heavily on Brunelleschi’s Florentine dome. What he eventually produced is much more complicated and monumental, with strongly articulated curved buttresses descending into twin columns outside the drum. He actually built the drum, but when he died in 1564, no work had been done on the dome. By now the pope was Pius IV, who told the two new architects, Pirro Ligorio and Giacomo da Vignola, to carry out Michelangelo’s plans without argument. Pirro ignored this injunction, started his own work on the attic inside the dome and was sacked. Vignola reintroduced the idea of subsidiary domes, which Bramante had abandoned more than sixty years before, and his successor, Giacomo della Porta, actually built two flanking domes, as we see them today. He demolished what was left of Bramante’s choir, vaulted Michelangelo’s dome, but increased the rake, and this meant that the outer shell is much steeper than Michelangelo’s broad shape, as well as nearly thirty feet higher. The dome was complete by 1593, but della Porta had to employ an engineer, Domenico Fontana, to work out the stresses, something none of his predecessors would have done, and evidence of the increasing specialization of the building industry, now operating with colossal masses. However, in architecture what matters is what is actually put up, and remains put up. Della Porta’s dome is markedly different in silhouette from Michelangelo’s, but it was built, and after a few years began to look not only right but inevitable. So his is the great dome shape that was imitated throughout Rome and eventually all over Europe. Thus della Porta, though not a great architect, certainly became an influential one.
There remained the façade, which had also been designed by Michelangelo, on a scale and width that even Bramante might have thought a touch too grandiose. It was more like an emperor’s palace than the front of a church, with its giant pilasters and pillars and endless bays. The spirit of this design was eventually carried out by a succession of five