Nadia Murad was kidnapped by the Islamic state and turned into a sex slave.
He invited Christians not to be like Herod who, in the face of Divine Light, preferred earthly lights of success and power.
They are from 10 countries: Iceland, Cabo Verde, Switzerland, The Bahamas, Qatar, Estonia, Grenada, Gambia and Malta.
Until now, the Vatican authorized only private pilgrimages.
