Ecumenical Patriarch Bartholomew I of Constantinople kisses the head of Pope Francis during a ceremony at the St George church, the principal Greek Orthodox cathedral, on November 29, 2014 in Istanbul as part of a three day visit in Turkey. In a highly symbolic gesture, the pope asked Bartholomew to kiss his brow in a blessing and bowed his head to show humility. Francis and Bartholomew -- who enjoy warm relations -- are working to narrow the differences between the two Churches that date back to the great schism of 1054 that split the eastern and western Christian Churches. AFP PHOTO / FILIPPO MONTEFORTE        (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)