I am not sure how many of the events that have unfolded in Rome over the past 35 years will make it into the history books. Certainly, the resignation of Pope Benedict XVI in 2013, the first pontiff to do so in six centuries,

Francis' hospital stay is raising questions about what happens if he loses consciousness for a prolonged period, or whether he might follow in Pope Benedict XVI's footsteps and resign.

The resignation of Pope Benedict XVI has demonstrated the process by which a pope might step down and be replaced.

The resignation of Pope Benedict XVI has demonstrated the process by which a pope might step down and be replaced.

Pope Francis’ hospital stay is raising obvious questions about what happens if he loses consciousness for a prolonged period, or whether he might follow in Pope Benedict XVI’s footsteps and resign if he becomes unable to lead.

A secret meeting, and echoes of Benedict’s exit, have heightened talk that Francis could resign, too. But the possibility is anyone’s guess.

Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.

Francis' hospital stay is raising questions about what happens if he loses consciousness for a prolonged period, or whether he might follow in Pope Benedict XVI's footsteps and resign.

(AP Photo/Gregorio Borgia) FILE-- A mosaic icon of Pope Francis is lifted to be placed next to the icon of Benedict XVI inside St. Peter and Paul’s Basilica in Rome, Monday, Dec. 9, 2013. (AP Photo/Alessandra Tarantino) FILE-- The tapestries showing late ...

Concerns over Pope Francis' health have mounted in recent years as have questions about his succession. Here's what we know.

The resignation of Pope Benedict XVI has demonstrated the process by which a pope might step down and be replaced.

The pope was admitted to hospital on February 14 where he is fighting a complex respiratory infection and pneumonia in both lungs.