In Christian tradition, the Holy Grail is traditionally said to have been used at the Last Supper.
The Last Supper is the meal Jesus shared with his disciples before his Crucifixion. The New Testament accounts describe Jesus using a cup while instituting the Eucharist, but they do not identify that cup as a uniquely preserved relic called the Holy Grail.
The Grail’s association with the Last Supper developed in medieval literature, especially works connected with Robert de Boron. Later stories added the idea that Joseph of Arimathea used the same vessel to collect blood from Jesus after the Crucifixion.
This distinction explains why the Grail is both a religious symbol and a literary legend. The Gospel narratives provide the meal and the cup imagery, while medieval romances build a continuing relic tradition around them. Different churches and historians have therefore treated proposed Grails as matters of devotion and tradition rather than universally proven history.