Pope Francis (L) is welcomed by Abu Dhabi's Crown Prince upon his arrival to the presidential palace in the UAE capital Abu Dhabi on February 4, 2019. - Pope Francis arrived in the UAE on February 3, the first ever papal visit to the Arabian Peninsula, birthplace of Islam, where he will meet leading Muslim clerics and hold an open-air mass for some 135,000 Catholics. (Photo by Giuseppe CACACE / AFP)