The Holy Grail

What is the truth behind this legend?

Did the Knights Templar protect a secret known as the holy grail?
Did King Arthurs Knights go off in search of the holy grail?

And.... if it the holy grail was a secret about the reality of Mary Magdalene (bless her), why would King Arthur's Knights go off in search of it?

I believe Jesus and Mary were married, and I also believe there were offspring. While I also believe this information would've been kept a secret by certain individuals who would benefit from it remaining that way.

But then.... I also believe there are other massive secrets relating to every other matter secretive 'organisations' want to keep a secret.

Look at the Freemasons for example? Look at the Illuminati?
Look at those weirdos who practice all manner of odd stuff, and keep it all in the back of their closet.

So is the "holy grail" just one secret, or several? Is it an object? And who is involved?

What does everyone think (or know)?

God bless...

AM