If y’all have done your PROPER/ Thorough/ Decades of research into Rennes-le-Chateau, The Holy Blood and the Holy Grail, Cathars, The Merovingians (Long-Haired Kings) Ormus, Mary Magdalene, Visigoths, The New Testament, Poussin, da Vinci, Teniers, Nostradamus, Rene d’Anjou, Jehanne d’Arc, Yolande of Aragon plus about a thousand…

…y’all will know to whom the building of the tomb bearing Et in Arcadia Ego is ascribed.

Clueage : One of the names in the previous post.