Sunday marked the end of a formal mourning period in the Catholic Church for Pope Francis, who died April 21 after 12 years in the papacy. He was 88. The pontiff's death catalyzed an extensive list of traditions dating back centuries,

The papal conclave will commence in May, when the cardinals will meet at St. Peter's Basilica and pray for the wisdom to select the next pope.

With 135 cardinals eligible to vote, the coming conclave is set to be the largest in the history of the Catholic Church and one of the most unpredictable in decades.