Saudi Arabia’s Crown Prince Mohammed bin Salman is reportedly the buyer of Leonardo da Vinci’s Salvator Mundi. Joint prayer has helped Christians to “abandon old prejudices”, Pope Francis has told members of the Lutheran World Federation. Ukrainian Orthodox leader Patriarch Filaret has said he would be willing to discuss autocephaly with Russian Orthodox Patriarch Kirill. The Pope has thanked a Polish delegation for donating this year’s Vatican Christmas tree (Edward Pentin). Ngala Killian Chintom reports on the split between Cameroon’s bishops. Kevin Mahnken explains how Fr Reginald Foster and others are helping to arrest the decline of Latin. And Hannah Brockhaus explores the ancient hill-town of Narnia. Follow me on Twitter @lukecoppen for updates throughout the day.