Burial site St Peter
Peter is seen as Christ's vicar on Earth (Lt: vicarius i.e. substitute)
Circus Nero with Egyptian Obelisk, now at St.Peter's square
Crucifixion and bones of St Peter:
Constantine's church in 370 AD:
St. Peter's Basilica over the old church 1500 AD:
The old necropolis (carefully preserved) is some five meters below the floor of the present day basilica. The round building located next to the obelisk seems to predate the circus. Centuries later, it became the Chapel of St. Andrew.
The transept crossing the nave directly over the high altar,
which was one level up and directly over the tomb:
Sometime during the 3rd century, the first shrine was built over the traditional site of Peter’s grave, the Tropaion or Trophy. It was a small 2 level structure of marble built into a wall covered with red plaster.
It stood in a courtyard, open to the sky, and accessible by narrow paths and steps down the slope and through the tombs. It was apparently a crowded place of pilgrimage.
The Tropaion was designed for the early Christian ritual of the celebratory meal at a martyr’s grave; perhaps even for an early form of Eucharist. The small slab in the floor of the shrine is at an askew angle to the shrine itself, perhaps reflecting the original orientation of the grave in the poor man’s cemetery beneath the more affluent later tombs.
The courtyard before the Tropaion was crowded with later burials. Numerous early Christian graves were found lying in a radial pattern around this central shrine. The shrine itself was rediscovered in excavations ordered by 20thC Pope Pius XII.
Vertical cross section:
Confessio below the altar below Bernini's Baldaquin:
