There are several chalices that are claimed to be the Holy Grail spread over the world. One of them is in a chapel of the Cathedral. Several Christian historians claim that the one in the chapel is most likely the authentic cup used at the Last Supper. It was the official papal chalice for many popes, and has been used by many others, most recently by Pope Benedict XVI, on July 9, 2006. This chalice dates from the 1st century. It was given to the cathedral by king Alfons el Magnànim in 1436.