A crown of thorns that was believed to have been worn by Jesus Christ, and which was bought by King Louis IX in 1239, is presented at Notre Dame Cathedral in Paris, Friday, March 21, 2014. To mark the 800th anniversary of Louis IX's christening, the crown of thorns will be displayed outside Notre Dame, at the Collegiate Church of Poissy, where King Louis IX was christened. (AP Photo/Remy de la Mauviniere)