Past Popes that have resigned?

[ArthurQArch]

How many Popes have resigned and under what circumstances did they do so? Anyone have a link that outlines this?

 

[gilliam]

— Marcellinus: This early church pope abdicated or was deposed in 304 after complying with the Roman emperor’s order to offer sacrifice to the pagan gods.

— Benedict IX: Sold the papacy to his godfather Gregory VI and resigned in 1045.

—Celestine V: Overwhelmed by the demands of the office, this hermetic pontiff stepped down after five months as pope in 1294. Pope Benedict XVI prayed at his tomb in the central Italian city of L’Aquila in 2009.

—Gregory XII: The last pope to resign, Gregory XII stepped down in 1415 to help end a church schism.

washingtonpost.com/national/on-faith/previous-popes-who-have-resigned-in-history-of-roman-catholic-church/2013/02/11/bd8fba54-7455-11e2-9889-60bfcbb02149_story.html

 

[gilliam]

More on Benedict IX here by the way. He ended up repenting.
oce.catholic.com/index.php?title=Popes_Benedict_I-X

 

[MarcoPolo]

I think Gregory’s was a rather heroic maneuver, and brilliant at once. Were there 3 popes at the same time?

 

[Joe_5859]

They missed Pope St. Pontian who resigned in 235 because he had been banished and he wanted to make it possible for the Church to elect a new Pope and move forward.

 

[ArthurQArch]

— Marcellinus: This early church pope abdicated or was deposed in 304 after complying with the Roman emperor’s order to offer sacrifice to the pagan gods.
…
washingtonpost.com/national/on-faith/previous-popes-who-have-resigned-in-history-of-roman-catholic-church/2013/02/11/bd8fba54-7455-11e2-9889-60bfcbb02149_story.html

My source (La guida a: I SOMMI PONTEFICI ROMANI) disagrees on Pope Marcellinus, stating that he was martyred by the Emperor Diocletian on October 25th, 304. The Emperor also martyred Sts. Agnes, Lucy, Bibiana, Lucian, & Sebastian about that same time.