Two popes to be canonised at Vatican
27 April 2014 Last updated at 02:37 BST
Final preparations are under way as St Peter's Square becomes the stage for one of the most spectacular events ever celebrated by the Roman Catholic Church.
The Vatican will hold the simultaneous canonisation by Pope Francis of two 20th-Century popes, who led the transition of the world's oldest international organisation into the modern world - John XXIII and John Paul II.
Former Pope Benedict, now in retirement, is also expected to be present.
Robert Pigott reports from Rome.