What connection can there be between Eleanor of Aquitaine, the French princess who married two kings and gave birth to three, one of whom was Richard the Lionheart, and the heretical Cathars who guard the Holy Grail in the castle of Montsegur in the Pyrenees?

How are they all linked to Emperor John III Doukas Vatatzes, thanks to whom the Byzantines regained the City, and to the Emperor of the Holy Roman Empire, Frederick II, who speaks Greek and corresponds with Vatatzes?

How are they connected to the Holy Grail, the famous Grail of the knights of King Arthur, as well as to Parsifal of von Eschenbach, the protagonist of Richard Wagner's last opera?

Fotis Papathanasiou creates a fresh narrative with the shining faces of 12th and 13th century Europe, compares the European East with the European West, and answers the question: "Where did the Grail go?".