The Holy Grail is different from real cups, vessels, dishes, and plates, is that the Holy Grail is a work of fiction, first appearing in the 11th and 12th centuries in medieval legends; the other things that you mention are real utensils used by men.
Grail Knight travel around the world just to heal the fisher king. This story was told by many in different ways.
The Mystery of the Grail was created in 1934.
Grail Prince was created in 2003.
The Unholy Grail was created in 1962.
The Children of the Grail was created in 1996.
The cast of The Grail - 2002 includes: Magdalena Andersson as The Grail Jim Babel as Eugene
In some versions of the legend, King Arthur and his knights search for the Holy Grail, but finding it is often left ambiguous or open to interpretation. The quest for the Holy Grail is a central theme in Arthurian legend but the outcome varies across different versions of the story.
Parzival is the real grail knight,not Gallahad
Grail Prince has 576 pages.
Chasing the Grail was created on 2010-01-26.
There are many false interpretations of the Holy Grail. For example as Mary Magdalene and the bloodline of Christ. But the real Holy Grail is a spiritual path which was described in the Arthurian romances. For an up to date scientific appraisal of the Grail story see http://www.theholygrail.org.uk.
The ISBN of Grail Prince is 0-345-4564-83.