In "The Duration and Nature of Future Punishment" by Henry Constable (1868), we find a little table of early writers and their views on this subject. The death date of each is given.

Barnabas (90), Clement of Rome (100), Hermas (l04), Ignatius,Martyr (107), Polycarp,Martyr (147). Justin,Martyr (164), and Theophius, of Antioch (183); all held to Scriptural view that supreme penalty for all who did not have life was eternal death.

Then came a couple of minor writers:

Athenagoras (190) and Tatian (200), who were steeped in Greek philosophies of Plato and Aristotle. The Greeks got their ideas from Babylon. So these two advanced idea of immortality of soul (Genesis 3:4 And serpent said unto woman, Ye shall not surely die:). Their writings were not taken too seriously and they were considered more or less as heretics.

Two more writers, true to Word, came in about this time. They were Irenaeus, Martyr (202) and Clement Alexandrinus (212).

Then Greek influence again was felt. Tertullian (235) not only came out with theory of immortality of soul, but he also taught eternal conscious torment of lost. This idea came especially from Greek myths, which they themselves did not believe. They were simply stories to entertain. Hippolytus (240) followed with same ideas.

This was so revolting to Origen (253) that he invented idea of universal restoration because he accepted theory of immortality of soul. Something had to be done with soul. Since man had become as God, (another lie of Satan), and had immortality and could not die, even God not having power to destroy him, there was a question of what to do with man.

Arnobius {303) still held to teaching of Scriptures. He was about last of those who had truth. Then followed Augustine {430). He fastened both false teachings, immortality of soul and eternal conscious torment of wicked, on to church and it has stuck till now. It is so strongly imbedded that no reformation seems to be able to eradicate it.