Leonardo da Vinci is one of history’s greatest artists and thinkers. Only about 15 of his paintings are known to exist and this one was thought to be lost forever. Leonard painted this masterpiece, called “Salvator Mundi” (Savior of the World) around 1500. It was owned by no less than three kings and, in 1763, it disappeared. This is the story of that incredible painting, how it was rediscovered in 2005, and what happened when it went to auction at Christie’s in November 2017.