Don't have Telegram yet? Try it now!
https://historymusings.wordpress.com/2013/02/11/history-q-a-february-11-2013-how-many-which-popes-have-resigned-from-the-papacy-in-the-history-of-the-catholic-church/
History Q & A February 11, 2013: How Many & Which Popes Have Resigned From the Papacy in the History of the Catholic Church?