Ecumenical Patriarch Bartholomew I of Constantinople leads the Divine Liturgy at the St George church, the principal Greek Orthodox cathedral, during the visit of Pope Francis on November 30, 2014 in Istanbul. Pope Francis held an ecumenical prayer, yesterday, in the Orthodox Church of St. George and a private meeting with Patriarch Bartholomew I, the 'first among equals' of the world's estimated 300 million Orthodox believers. In a highly symbolic gesture, the pope asked Bartholomew to kiss his brow in a blessing and bowed his head to show humility.  AFP PHOTO / FILIPPO MONTEFORTE        (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)