When the Duke of Milan, Lodovico Sforza, commissioned Leonardo da Vinci to paint a depiction of the Last Supper on a refectory wall of the Dominican convent, Santa Maria delle Grazie, he could not have dreamed of the ways in which the painting would capture the imagination of not just academic scholars but the mass public over five hundred years after its creation. A masterwork which survived a bombing in the Second World War and was nearly lost due to a miscalculation by the painter himself has inspired authors and historians to pen theories about its meaning—the most popular and controversial being the claim that Mary Magdalene was the wife of Jesus and is the figure seated to his right in the painting.
Beyond Dan Brown, the author of The Da Vinci Code, there have been other writers and theorists who have made claims about having unlocked the secret of Leonardo’s masterwork. {1} Of these theories, the most intriguing is Laura Knight-Jadczyk’s contention that Leonardo mapped the constellation of Cassiopeia within the Last Supper. The stars beta Cassiopeiæ, delta Cassiopeiæ, gamma Cassiopeiæ and epsilon Cassiopeiæ are fixed to the hands of Peter and Jesus while the star alpha Cassiopeiæ is fixed to Jesus’s forehead. It should not be overlooked that Leonardo elegantly used hands to signify the constellation once described by Arabian astronomers as the “Hand Stained by Henna” and, curiously, that Julius Schiller in his Coelum Stellatum Christianum replaced the name of this constellation with St. Mary Magdalene. {2}
While the notion of embedding astronomical data within a literary work is not foreign to the study of myths and legends, it’s a more unusual occurrence in artworks. For instance, the number 10,800, which is an important cosmological number, equals the number of stanzas in the sacred Hindu text, the Rigveda; it is the number of years referred to by Heraclitus as the cosmic cycle of the Magnus Annus; and it is the number of bricks of the Indian bird-shaped fire-altar, the uttaravedi or “northern altar,” which is part of the world’s oldest surviving ritual, the Agnicayana. Further, it is a number echoed by the 108 large stone figures (per avenue) at the sacred temple complex, Angkor Wat, and by the 108 suitors courting Penelope in Homer’s Odyssey. {3} For an individual with the breadth of knowledge and curiosity of Leonardo it should not be surprising that he would incorporate a cosmological map within his painting.