Claim: Clementine Chapel was used to house the skull of a saint.

The Clementine Chapel , also known as La Clementina , is a particular Roman Catholic chapel located within the underground necropolitan grottoes of Saint Peter 's Basilica in Vatican City . It is the area where the relics of St. Peter were venerated in early medieval times , before his skull was removed to be housed at the Archbasilica of St. John Lateran .   Open today for pilgrims , the site venerates the original pavonazzo marble monument placed there by Emperor Constantine , and was used in early medieval times to house the skull of St. Peter