son, are picked out in gold leaf. The baldacchino stands as a vast free-standing sculptural object, central to and framed by the largest space within the building. It is so large that the visual effect is to create a link between the enormous dome which appears to float above it, and the congregation at floor level of the basilica. It is penetrated visually from every direction, and is visually linked to the Cathedra Petri in the apse behind it and to the four piers containing large statues that are at each diagonal. As part of the scheme for the central space of the church, Bernini had the huge piers, begun by Bramante and completed by Michelangelo, hollowed out into niches, and had staircases made inside them, leading to four balconies. There was much dismay from those who thought that the dome might fall, but it did not. On the balconies Bernini created showcases, framed by the eight ancient twisted columns, to display the four most precious relics of the basilica: the spear of Longinus, said to have pierced the side of Christ, the veil of Veronica, with the miraculous image of the face of Christ, a fragment of the True Cross discovered in Jerusalem by Constantine's mother, Helena, and a relic of Saint Andrew, the brother of Saint Peter. In each of the niches that surround the central space of the basilica was placed a huge statue of the saint associated with the relic above. Only Saint Longinus is the work of Bernini. (See below) Cathedra Petri and Chapel of the Blessed Sacrament Bernini then turned his attention to another precious relic, the so-called Cathedra Petri or "throne of St. Peter" a chair which was often claimed to have been used by the apostle, but appears to date from the 12th century. As the chair itself was fast deteriorating and was no longer serviceable, Pope Alexander VII determined to enshrine it in suitable splendor as the object upon which the line of successors to Peter was based. Bernini created a large bronze throne in which it was housed, raised high on four looping supports held effortlessly by massive bronze statues of four Doctors of the Church, Saints Ambrose and Augustine representing the Latin Church and Athanasius and John Chrysostom, the Greek Church. The four figures are dynamic with sweeping robes and expressions of adoration and ecstasy. Behind and above the