Pope Francis died on Easter Monday at the age of 88 after a 12-year papacy. The death of the pontiff has set off mourning across the Catholic world and days of ritual at the Vatican.

As the world mourns Pope Francis' death, here is what you need to know about the Novemdiales, or the nine days of mourning.

Most of the funeral will be celebrated in Latin, and there will be incense and hymns and Gregorian chants. Attended by dozens ...