Indiana Jones and the Grail Tablet

The grail tablet was one of two markers left by three brother knights of the first crusade. The third night who was dying of extreme old age tells his story to a Franciscan friar, that he, along with his two brothers, Richard and the Grail Knight had set out to find and protect the Holy Grail of Jesus Christ.  Which they did in the temple of the sun in the canyon of the Cresent moon in Halay. 150 years after finding the grail two brothers started their journey back to France leaving the grail knight to guard the relic. The grail tablet was one of the markers left by one of the two returning brothers. The other was Sir Richards's shield buried with him in the catacombs of Venice.  Both markers were there to describe the location of the Holy Grail. The tablet was made of sandstone, made in the Middle East, and was found by Walter Donovan's people who digging out there for copper in the mountains north of Ankara, I believe.x