The funeral of the pope is underway in Vatican City, where throngs of mourners have gathered to give a final send-off to Francis, who will be remembered as a champion of migrants and the poor, and for his efforts to reshape the Catholic Church.

The funeral of Pope Francis will be attended by more than 150 delegations, including 54 heads of state and 12 reigning sovereigns, the Vatican confirmed, as well as thousands of faithful. Here is what exactly happens leading up to and during the funeral: writes Emily Smith and Tom Ross, PA.