Origin of purgatory

Where did the doctrine of purgatory come from?

Many people have asked this question over and over again. Our team(moderation team) has done some research and found a couple of answers. We've figured out that the doctrine of purgatory was confirmed at the Second Council of Lyons, Council of Florence, and the Council of Trent for the Decree on purgatory. The word "purgatory" comes from the Latin word purgare which means to make clean or to purify. This doctrine was founded in the old times when the people thought that they were basically not worthy for heaven so they created a "waiting place" for those people.

http://kindacatholic.org/2014/06/06/church-teaching-purgatory-come/
http://www.newadvent.org/cathen/12575a.htm
http://www.mtc.org/purgtory.html

   Moderation Team
   Andrea Solórzano, Noelia Velasquez, Paolo Rappaccioli, and Nain Miranda