The Holy Grail is a wine cup used by Jesus and his 11 disciples after he sent Judas Iscariot away at the Passover Dinner on the 14th day of the Jewish calendar month in 33 A.D. Jesus once took the cup and told his disciples to drink the red wine inside, which symbolized his blood, to create the crucifixion ceremony. Later, some people thought that this cup had some magical power because of this special occasion. It is said that the magic furnace of the peaceful world is the predecessor of the Holy Grail.
The traditional view of the Holy Grail is that it is a chalice that once contained the blood of Christ. Later, Joseph of alimarcia brought the Holy Grail to England. It is believed that Joseph took it to glastonburg in the south of England. Since then, the whereabouts of the Holy Grail has become a mystery. It is said that the cup, or the Holy Grail, was used at the last supper.
Source: @trashtristantattoo