French curators had worked for a decade to prepare a major exhibition marking the 500th anniversary of the death of Leonardo da Vinci. When it opened, though, the most talked-about painting they had planned to show — “Salvator Mundi,” the most expensive work ever sold at auction — was nowhere to be seen.

Plucked from shabby obscurity at a New Orleans estate sale, the painting had been sold in 2017 as a rediscovered “lost” Leonardo and fetched more than $450 million from an anonymous bidder who kept it hidden from view. The chance to see it at the Louvre museum’s anniversary show two years later had created a sensation in the international art world, and its absence whipped up a storm of new questions.

Had the Louvre concluded that the painting was not actually the work of Leonardo, as a vocal handful of scholars had insisted? Had the buyer — reported to be Saudi Arabia’s Crown Prince Mohammed bin Salman, though he had never acknowledged it — declined to include it in the show for fear of public scrutiny? Read more