Cardinal Mario Aurelio Poli holds up a reliquary containing pieces of the robes of Pope John Paul II and his predecessor Pope John XXIII at the Buenos Aires' cathedral April 27, 2014. Pope Francis proclaimed his predecessors John XXIII and John Paul II saints in front of more than half a million pilgrims on Sunday, hailing both as courageous men who withstood the tragedies of the 20th century. REUTERS/Enrique Marcarian (ARGENTINA - Tags: RELIGION)