Hundreds of thousands of pilgrims are gathering in Vatican City a day before Pope Francis and his predecessor Benedict XVI confer sainthood on John Paul II and John XXIII in a historic effort to unite the Catholic Church.

The canonisation of two of modern-day Catholicism's most influential figures will be presided over by Pope Francis at a grandiose mass co-celebrated with the 87-year-old Benedict XVI in a rare public appearance.

Al Jazeera's Jonah Hull reports from Vatican City.

Source: Al Jazeera