The “early” Early Church Fathers (from AD 202 and earlier) believed in a place of purgation (taken from
scripturecatholic.com/purgatory.html):
The Early Church’s Belief in Purgatory
“And after the exhibition, Tryphaena again receives her. For her daughter
Falconilla had died, and said to her in a dream: Mother, thou shaft have this stranger Thecla in my place, in order that
she may pray concerning me, and that I may be transferred to the place of the just.”
Acts of Paul and Thecla (A.D. 160).
“Abercius by name, I am a disciple of the chaste shepherd…He taught me…faithful writings…These words, I, Abercius, standing by, ordered to be inscribed. In truth, I was in the course of my seventy-second year.
Let him who understands and believes this pray for Abercius.” *Inscription of Abercius (A.D. 190). *
“Without delay, on that very night, this was shown to me in a vision. I saw Dinocrates going out from a gloomy place, where also there were several others, and he was parched and very thirsty, with a filthy countenance and pallid colour, and the wound on his face which he had when
he died. This Dinocrates had been my brother after the flesh, seven years of age? Who died miserably with disease…
But I trusted that my prayer would bring help to his suffering; and I prayed for him every day until we passed over into the prison of the camp, for we were to fight in the camp-show. Then was the birth-day of Gets Caesar, and** I made my prayer for my brother day and night**, groaning and weeping that he might be granted to me. Then, on the day on which we remained in fetters, this was shown to me. I saw that that place which I had formerly observed to be in gloom was now bright; and Dinocrates, with a clean body well clad, was finding refreshment. And where there had been a wound, I saw a scar; and that pool which I had before seen, I saw now with its margin lowered even to the boy’s navel. And one drew water from the pool incessantly, and upon its brink was a goblet filled with water; and Dinocrates drew near and began to drink from it, and the goblet did not fail. And when he was satisfied, he went away from the water to play joyously, after the manner of children, and I awoke.
Then I understood that he was translated from the place of punishment.” *The Passion of Perpetua and Felicitias, 2:3-4 (A.D. 202). *
“Accordingly the believer, through great discipline, divesting himself of the passions, passes to the mansion which is better than the former one, viz., to the greatest torment, taking with him the characteristic of repentance from the sins he has committed after baptism. He is tortured then still more–not yet or not quite attaining what he sees others to have acquired. Besides, he is also ashamed of his transgressions. The greatest torments, indeed, are assigned to the believer. For God’s righteousness is good, and His goodness is righteous.
And though the punishments cease in the course of the completion of the expiation and purification of each one, yet those have very great and permanent grief who are found worthy of the other fold, on account of not being along with those that have been glorified through righteousness.” *Clement of Alexandria, Stromata, 6:14 (post A.D. 202). *
There is also a TON of scriptural references to praying for the dead (leading to Purgatory) at:
scripturecatholic.com/purgatory.html
(I apologize if you already knew of this excellent website…)
One more thought: In general, the absence of ECF writings on a doctrine (this is not the case in regards to praying for the dead) do not prove the lack of that doctrine. ECF writings were very pastoral, and usually used to CORRECT mis-understandings or controversies in the Early Church. It is FLAWED LOGIC to assume that that, in general, a doctrine did not exist because an ECF didn’t write about it.