I love this question! 10 points!

If this were QI, I would expect to get a klaxon for my answer. (Does anyone know the show QI here? ) Anyway, according to people who know a lot more about european literature than I do, the "grail" would have been a tray. Not a cup or chalice.

So maybe both options are kind of right. Anything old is historical... but also a myth.

Thanks for the atlas obscura link. (All I can do until covid is over is armchair traveling.)

Of course it is a myth. Most things people search for in Christianity became "real" only after 300 CE. If Jesus was historical at all there is no reason to believe that in his own timeline he drank from a special cup (holy grail) or that any person of that time would have preserved such a cup after he was crucified. In other words, the Jesus hype of today was not the thing of 33 CE. It had to of came later. Funny how others are writing books today of finding the "holy grail" whether it was cup, saucer, chalice, or what ever. In 2014 a book was written saying the grail is in a church in Spain.

The mind is a powerful force. I sometimes wonder if there were a cataclysm that somehow destroyed most human and other life on earth along with records of all the crap we have created, worshiped or otherwise deemed important what the surviving humans would do with their second chance.
I think these tales are allegorical/symbolic of the inner treasure(s) we all possess but sometimes the truly brilliant shine brighter and myths are made of them. We see that expressed in all forms of art.
The evil, well, we've seen that too.

Everything having anything to do with Christianity or any other religion is total bullshit.

In the dark dim cobwebbed cellars of brain something is staring saying that the earliest mention of the holy grail is a romantic medieval story. I have no referance for it, I think it was on a tv documentry years ago

Miss Myth, it's a myth, Miss!

Theists and atheists alike are somehow committed to the idea that myths are to be taken literally, with the former believing they are true and the latter convinced they are not.

But they equally miss the true meaning of the stories by refusing to consider a symbolic interpretation.

The grail is not a relic, authentic or fake. The reason no one can find it is they don’t know what they’re looking for. It’s not a material thing, but a symbol of a psychological treasure instead.

This is all pretty well understood by the scholars of various related literature today, but seemingly unknown and often even forcefully denied by everyone else, be they believer or unbeliever.

Okay, for the sake of argument, let us ASSUME that, just as the entire bible is totally based on nothing more than myths, etc, the 'Holy Grail' actually existed.
Since this mythical Jesus was little more than the itinerant son of a carpenter, actually wandering around the country-side with NOTHING more than the clothes on his back, staying homes belonging to the poorer peoples then,
a) would NOT this Holy Receptacle from which wines was assumed to have drunk at the Last Supper have been either made from baked clay or shaped from wood rather than gold or some other metal,
b) is there an tangible evidence that has been empirically tried, tested and proven that such a receptacle EVER actually existed in the first place,
c) is NOT logically possible and HIGHLY probable that someone somewhere can 'create' such an item and pass it off as the 'Real McCoy,' ( IT has been done before and quite successfully I might add)
d) was the 'receptacle' actually marked with the words such as, Jesus' cup, do not use or 'Property of Jesus,' etc, etc.

Now I have here in MY possession a nail made from copper, a very common metal used for nails, etc, during the early Bronze age and before as well, I can claim that that Copper nail IS a 100% genuine relic from the site where the Ark of Noah came to rest after the Great Flood.
Can anyone show proof that my claim is not the truth?

I am a demoniacally who is possessed by a demon/devil/ and despite it also think that that the methodists and others of its area think that demonic possession actually transpires