Despite his hospitalization, Francis has been actively participating in the Vatican's Lenten spiritual retreat remotely via videoconference. The retreat, which began Sunday, is led by Father Roberto Pasolini and focuses on "The hope of eternal life." While Francis can see and hear the sessions, those present in the Vatican cannot see or hear him.

With Pope Francis entering his fourth week in hospital, those working in the Apostolic Palace are grappling with the continuing uncertainty over the pope’s health. The same is true for everyone in the Vatican.

Pope Francis, head of the Roman Catholic Church, has held his title for 12 years. What to know about the Jesuit.