Leonardo painted the mural for the Dominican convent of Santa Maria delle Grazie in Milan, on a commission from Ludovico Sforza, ruler of Milan.1 The museum dates it to 1495–1498.2
Instead of true fresco, Leonardo painted on the dry wall so that he could work slowly and revise.2 The paint began to flake within a few years, and later damage, including a doorway cut in 1652 and bombing in 1943, made its survival precarious.1 A restoration completed in 1999 lasted about twenty years.2 Since 1980 the work has been part of a UNESCO World Heritage Site.2