What was the name of the Pope of the Roman Catholic Church that was elected Pope, but soon resigned?

Question

and returned to a monastery?

Answer 1

Pope Celestine V, over 700 years ago. He was literally dragged from a cave where he lived as a humble Benedictine monk and made Pope. I believe he reigned only 5-6 months before he "quit". He was later imprisoned by a Pope and died there.

Answer 2

The Code of Canon Law (Canon 332 §2) allows for a papal resignation:

If it happens that the Roman Pontiff resigns his office, it is required for validity that the resignation is made freely and properly manifested but not that it is accepted by anyone.

http://www.vatican.va/archive/ENG1104/__P16.HTM

Here are a few popes who resigned:

Pope Benedict IX in 1045: http://www.newadvent.org/cathen/02429a.htm

Pope Gregory VI in 1046: http://www.newadvent.org/cathen/06791a.htm

Pope St. Celestine V in 1294: http://www.newadvent.org/cathen/03479b.htm

Pope Gregory XII in 1415: http://www.newadvent.org/cathen/07001a.htm

With love in Christ.

http://www.newadvent.org/cathen/01031a.htm

Answer 3

I think he died. Pope John Paul I, a real Christian. I think they poisoned his nightly hot chocolate drink.