Clementine Chapel (Clementina) in the Vatican Grottoes of St Peter's basilica.In the center of the peribolos is the Clementine Chapel; the gem of the Vatican grottoes and the precious chest protecting the sepulcher of St Peter. Behind the altar; protected by a gilded bronze grid; are the remains of the Memoria Petri; the monument built by Constantine to protect the mortal remains of Peter. It is built of two slabs of pavonazzetto marble separated by two porphyry strips.During the first millennium; it was here that solemn oaths were sworn; donations to the Church were made; the Pallia of the Archbishops were blessed and grand treaties and acts of reconciliation were sanctified.Starting from 1592; the ancient chapel was modified and embellished by Clement VIII and was named Clementina. Pope Clement VIII had his oratory enriched by decorating the walls with precious marbles and gilded stuccos that can still be admired today.( Saint Peter's basilica; basilique Saint-Pierre; Petersdom. )Vatican 2015