Francis is expected to use his opening speeches today to denounce the violence being committed in God's name by the extremists, and to express solidarity with the Christians and other religious minorities who have been targeted by the onslaught, massacred or forced to leave their homes.
The three-day visit will also give Francis a chance to reach out to Turkey's tiny Christian community less than 1 per cent of Turks are Catholic and visit with the spiritual leader of the world's Orthodox Christians, Ecumenical Patriarch Bartholomew I.
Security will be tight: Turkish media reports said some 2,700 police officers would be on duty during the Ankara leg of the trip alone, and that a court had issued an order allowing police to stop and search cars and carry out random identity checks on people along routes used by the pope.
On the eve of his trip, Francis repeated that it was legitimate to use force to stop the Islamic State advance, but only with the endorsement of the international community.
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Francis will wade into some local controversy when he is received Friday by Turkish President Recep Tayyip Erdogan at his huge new palace in Ankara, a 1,000-room complex on once-protected farmland and forest that dwarfs the White House and other European government palaces.
Francis, whose spartan living conditions are well-known, will spend this afternoon at the USD 620 million White Palace, meeting with the president, prime minister and delivering a speech to Turkish dignitaries and diplomatic corps.