Pope John Paul II celebrated Mass with the Holy Chalice in Valencia in November 1982, and in that occasion the Pope referred to it as "a witness to Christ's passage on earth". In July 2006, at the closing Mass of the 5th World Meeting of Families in Valencia, Pope Benedict XVI also celebrated Mass with the Holy Chalice, on this occasion calling it "this most famous chalice" (hunc praeclarum Calicem), words in the Roman Canon said to have been used for the first popes to refer to the Holy Grail until the 4th century in Rome. Genoa Chalice The Sacro Catino, kept in Genoa Cathedral, is a hexagonal dish of the Roman era made of green Egyptian glass, some 9 cm high and 33 cm across. It was taken to Genoa by Guglielmo Embriaco as part of the spoils from the conquest of Caesarea in 1101. William of Tyre (10.16) describes it as a "vessel of the most green colour, in the shape of a serving dish" (vas coloris viridissimi, in modum parapsidis formatum) which the Genoese thought to be made of emerald, and accepted as their share of the spoils. William states that the Genoese were still exhibiting the bowl, insisting on its miraculous properties due to its being made of emerald, in his own day (Unde et usque hodie transeuntibus per eos magnatibus, vas idem quasi pro miraculo solent ostendere, persuadentes quod vere sit, id quod color esse indicat, smaragdus), the implication being that emerald was thought to have miraculous properties of their own in medieval lore and not that the bowl was thought of as a holy relic. The Sacro Catino would later become identified as the Holy Grail. The first explicit claim to this effect is found in the Chronicon by Jacobus de Voragine, written in the 1290s. Pedro Tafur, who visited Genoa in 1436, reported that the Holy Grail, "made of a single emerald" is kept in Genoa Cathedral. The bowl was seized and taken to Paris by Napoleon in 1805, and it was damaged when it was returned to Genoa in 1816, in which occasion it was confirmed it is made of glass rather than emerald. Modern candidates Aside from the Holy Chalice of the Cathedral of Valencia, believed to be the Holy Grail since the first centuries AD, and which has been used by popes to celebrate Mass until nowadays, and the Sacro