The Tempietto del Bramante dates back to 1502, and it was erected as a “martyrium” to remember the execution of St. Peter. Below the round room there is a crypt, where a plaque on the floor protects the hole that was supposedly left from the cross of St. Peter.
The building was ordered by the Spanish royal family because of a vow made for the birth of their first son, John, who dies in 1497.
