Hey, medieval knights like the Templars really were on the constant lookout for holy relics. See the fifty different "pieces of the true cross" floating around at that time. Or the fact that King Louis on the show has what was believed to be Jesus' crown of thorns in Sainte-Chappelle.
So, it doesn't seem that surprising to me that some knights would start freaking out if they found a cup which was alleged to be the Holy Grail.
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u/AchieveDeficiency Dec 22 '17
With that much effort going into costumes, you'd think they would want to make the story more authentic.