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S.Peter's, Rome(begun 1506.consecrated I626)(pp.868C.870, 871, 902C, 905), the largest and most important building of the Renaiance, owes the nucleus 0f its design to Bramante, although many other architects were to work on it.It was Julius II's whim to install a coloal tomb for himself in the choir(begun by Nicholas V, c.J 450)that precipitated the decision to rebuild the ancient basilica completely.Bramante made several variant designs for the new building, but all envisaged that directly above the tomb of S.Peter would rise an enormous dome of roughly the same size as the Pantheon's, supported upon four maive croing piers.The so-called

Parchment Plan’(Uffizi.Florence)and the foundation medal of 1506 show a Greek-cro plan within a square, with four subsidiary domes, lowers at the corner,and half-domes terminating each of the four arms, Such a design is the realisation of the theoretical preference for centralised planning, but also derives from such esteemed funerary churches as S, Mark's, Venice as well as ancient mausolea.Despite its size however, the Greek-cro plan would not have covered the site of the old basilica, nor would it have suited congregational or proceional needs: ultimately a Latin cro with an extended eastern arm was preferred(p, 871Gg)

Bramante's building would have had a relatively severe exterior, depending for its effect on the hierarchical maing of geometric forms(rather like his earlier project for Pavia Cathedral).The dome, known both from the modal and form a woodcut in Serlio's treatise, was to be a single-shelled hemisphere, presumably made of concrete and with a stepped profile derived from the Pantheon;it would have been raised up on a colonnaded drum and surmounted by a lantern(p.870B).For the interior of the building Bramante intended to use paired Corinthian pilasters supported on tall pedestals(the flour level was later raised by Sangallo).His highly original and influential chamfered croing piers, although later much enlarged, still survive in the completed building, enabling the nave and transepts to widen at the croing and giving a smooth transition between pier and pendentive.In general, Bramante's sculptural approach to piers and wall ma.inspired by Roman architecture, represents a new spatial conception of great importance.After the death of Julius(1513).Leo X appointed Fra Giocondo and the ageing Giuliano da Sangallo as co-architects, but on Bramante’s own demise(1514)it was Raphael who became architect-in-chief.At this period numerous proposals were made for the continuation of the building.Raphael's own design was a Latin cro retaining many of Bramante's ideas including file dome, although the croing piers were enlarged.Raphael proposed the addition of ambulatories around the ends of the three short arms of the cro, and intended the building to have a monumental porticoed facade, with a giant order interlocking with smaller orders, between elaborate towers.At Raphael's death(1520), Antonio da Sangallo the younger was elevated to architect-in-chief, aisted by Peruzzi.Peruzzi proposed many designs, including a return to the Greek cro idea, but Sangallo's final model, commiioned in 1539.is eentially a revision and expansion of Raphael’s design.The Sangallo scheme(p.87OD,G)has been much abused following Michelangelo's condemnation of its 'German' qualities and lack of light.The apparent lack of unity in the model would have been offset in execution by the very scale of the building, complemented by the maing of so many parts.The western region of the model(liturgical cast end)is a Greek cro with three ambulatories, but the plan becomes a Latin cro by the addition of a subsidiary domed link

connecting with the facade block.Between the towers the close-packed articulation of the two-storey facade projects at the main portal with an unprecedented plasticity.When Michelangelo was appointed as Sangallo's succeor in 1546 he embarked on a radically new project involving the demolition of the Raphael/ Sangallo southern anbulatory.By Michelangelo's death(1564), his project was all but realised, and his designs for the dome were eentially followed afterwards.Michelangelo's S Peter's, claimed to be a restoration of Bramante's, is in fact a reduced and simplified Greek cro(p.870F)ingeniously formed from the nucleus inherited from Sangallo, The abolition of the ambulatories created a much better lit and more unified interior a greatly reduced cost.The external walls are articulated with rhythmically spaced giant Corinthian pilasters, laid over unmoulded vertical strips.By splaying the re-entrant angles the pilaster wall skirts the building like a giant curtain.Above an attic, concealing much of the vaulting, rises Michelangelo's majestic dome(built by Giacomo della Porta, 1588-91)which has a drum buttreed by paired attached columns, continuing up into external ribs on the dome surface, and further paired columns in the lantern.The pointed profile of the dome(although rather steeper than Michelangelo intended)recalls Florence Cathedral, as does its double-shelled method of brick construction.This allows the outer shell to rise much higher than the inner, forming with the four subsidiary domes a pyramidal composition the unity of which is enhanced by the verticality of all the external articulation.With its crown-like lantern the building rises to 137.5m(451 ft).Thus, despite the reduction in scale, Michelangelo's building is still enormous-the dome is 42 m(138 ft)in diameter, only 1.5 m le than the Pantheon.Michelangelo's design was continued by Vignola(appointed 1564), Ligofio(1565), Giacomo della Porta(1572)and Domenico Fontana(1585).Carlo Maderno lengthened the nave, converting the church into a Latin cro(building length 194m.63bft)(p.871G)and designing his own facade(1606-12), which, although continuing Michelangelo's giant order, looks back to the designs of Raphael and Sangallo.Maderno's extension unavoidably conceals much of Michelangelo's dome even from Bernini's piazza(q.v.).The sumptuous internal decoration was largely carried out in the seventeenth century under Bemini, who succeeded Maderno as architect-in-chief in 1629.Also by Bernini is the famous bronze baldacchino(1624-33)over S.Peter's tomb, and the spectacular Cathedra Petri(1656-65), filling the western apse and housing the supposed throne of the apostle.