 "The Last Supper" has been the target of much speculation by writers and historical revisionists alike, usually centered on purported hidden messages or hints found within the painting, especially since the publication of Dan Brown's novel "The Da Vinci Code" (2003), in which one of the characters suggests that the person to Jesus' right (left of Jesus from the viewer's perspective) is actually Mary Magdalene.It also states that there was a letter ‘glaring in the center of the painting’ (M) standing for Matrimonio or Mary Magdalene.This speculation originated in earlier books "The Templar Revelation" (1997) by Lynn Picknett and "The Holy Blood and the Holy Grail" by Michael Baigent, Henry Lincoln and Richard Leigh (1982).